Sarcopenia: Muscle Loss With Age, Self-Tests and What Works

Sarcopenia is a progressive muscle disease in which strength, muscle mass and physical function decline, and it is linked to more falls, fractures, disability and earlier death.¹ With age, strength usually fades two to five times faster than muscle mass,² and you can check yours at home in about two minutes. Muscle keeps responding to training well past 80:³ the guideline treatment is strength training two to three times a week,^4,5 with at least 1.0 to 1.2 g of protein per kg of body weight a day for healthy people over 65.^6,7

This guide is for anyone who has noticed that stairs, heavy bags or getting up from a low chair feel harder than they used to, for anyone planning ahead, and for adult children looking out for a parent. Every number from research links to its source.

What is sarcopenia?

The European working group EWGSOP2 defines sarcopenia as a progressive disease of the skeletal muscles and grades it in three stages: probable when strength is low, confirmed when muscle quantity or quality is also low, and severe when physical performance is poor as well.¹

Strength sits first in that definition because it is currently the most reliable measure of how well a muscle works.¹ Muscle mass has to be measured with a DXA scan or estimated with bioelectrical impedance,¹ while strength can be tested in a doctor's office or at home.¹

Doctors also distinguish primary sarcopenia, which is mostly due to aging, from secondary sarcopenia, where another cause such as an illness or long inactivity can be found.¹ Sarcopenia that has lasted less than six months, usually after an illness or injury, is called acute; once it has lasted six months or more, it is called chronic.¹ Sarcopenia is not the same as frailty, which is a broader syndrome of decline across several body systems with physical and social sides.¹ A related diagnosis, sarcopenic obesity, combines excess body fat with low muscle mass or function.¹³

How common is it? Depending on the definition, 10% to 27% of people aged 60 and over had sarcopenia across 151 studies, and 2% to 9% had severe sarcopenia.¹⁴ Even whether men or women look more affected flips with the cut-offs used.¹⁴ In 2024, 107 specialists from 29 countries agreed a first global conceptual definition; its cut-offs, which could make these numbers comparable, are still being worked out.¹⁵

In the United States, sarcopenia has had its own diagnosis code, ICD-10-CM M62.84, since 2016.¹⁶

How fast do you lose muscle with age?

Muscle loss adds up slowly. Studies comparing adults aged 18 to 45 with people over 65 find a median loss of 0.47% of muscle a year in men and 0.37% in women,² and beyond 50, leg muscle has been reported to fall 1% to 2% a year.¹ Strength falls much faster than mass: in long-term studies around age 75, women lost 0.64% to 0.70% of their muscle mass per year and men 0.80% to 0.98%, while strength fell 2.5% to 3% a year in women and 3% to 4% in men.²

The same pattern appears in a large American study of 1,880 people in their 70s: leg strength fell 2.6% to 4.1% a year, about three times faster than leg lean mass (muscle plus water and other non-fat tissue¹⁷), which dropped by roughly 1% a year.¹⁸ Power, the ability to produce force quickly, goes earliest.¹⁹ In a comparison of 100 healthy people aged 65 to 89, leg power was about 3.5% lower for each year of age, against 1% to 2% for strength (a comparison across ages, so not directly comparable with the long-term rates above),²⁰ partly because the fast type 2 fibers, which can produce about four times the power of slow fibers, shrink more with age.^19,21

Why does strength fall faster than size? Part of the answer sits in the nerves. Physically active men around 71 had 50% to 60% fewer motor units (the nerve cells and the fibers each one drives) in a main thigh muscle than young men,²² and the loss of motor neurons leaves muscle fibers without a nerve supply faster than the remaining nerves can rescue them.²³ An autopsy study of one thigh muscle in 43 men found that it starts shrinking around age 25, mainly because fibers are lost, and that the loss then speeds up.²¹

Strength across the lifespan

In nearly 50,000 people in Great Britain, grip strength rose to a peak in early adulthood (a median of 51 kg in men between 29 and 39, and 31 kg in women between 26 and 42), held through midlife and then declined.²⁴ At 70 the median was 39 kg for men and 24 kg for women; at 80 it was 32 kg and 19 kg.²⁴ By 80, about one in four had weak grip strength: 23% of men and 27% of women.²⁴

The spread matters more than the average. At 70, the strongest tenth of men gripped 49 kg or more and the strongest tenth of women 31 kg or more, about the same as the median 40-year-old (50 kg and 31 kg).²⁴ These data compare different people at different ages, not the same people over time, but they show how widely people differ at the same age.

Grip matters beyond the hand. In almost 140,000 adults aged 35 to 70 across 17 countries, every 5 kg lower grip was linked to a 16% higher risk of death over a median of four years, and grip predicted death better than systolic blood pressure did.²⁶ That is an association, not proof that training your grip extends life, but it explains why doctors measure it. For more markers of this kind, see our longevity biomarkers reference.

Signs that you are losing muscle

Because strength fades faster than muscle size, weakness usually shows up in everyday tasks before it shows in the mirror.² The SARC-F questionnaire doctors use is a good checklist: it asks how hard it is to lift or carry 10 lb (about 4.5 kg), walk across a room, get up from a chair or bed and climb a flight of 10 steps, and how often you have fallen in the past year.²⁷

Typical early signs:

• You push off with your hands to get up from a sofa or a low chair.
• Carrying shopping bags or a suitcase tires your arms quickly.
• Stairs make your thighs burn, or you reach for the handrail more than you used to.
• You walk more slowly than the people around you.
• Jars and bottles have become harder to open.

Losing muscle even though you work out? Common reasons are eating too little while dieting,²⁸ training that is mostly cardio with little heavy resistance,²⁹ loads that never get heavier, or a recent illness or bed rest.¹¹ The scale can also mislead: body-composition scales do not measure muscle directly; they estimate it from electrical conductivity,¹ so a single reading means little.

Test yourself at home in two minutes

A few quick tests tell you more than any scale. Two of them count toward probable sarcopenia in the European definition: five chair rises (also called the five-times sit-to-stand) and, if you own a hand dynamometer, grip strength.¹ The 30-second chair stand compares your count with age and sex norms,³⁰ a timed 4-meter walk shows how well your strength carries into daily life,¹ and the SARC-F questionnaire completes the picture.

Before you start: push a sturdy chair against a wall, wear flat shoes, and have someone nearby if you feel unsteady. Stop if you feel pain, dizziness or chest discomfort.

1. Five chair rises. Sit on a firm chair without armrests, arms crossed over your chest. Stand up fully and sit down five times as fast as you safely can. More than 15 seconds means low strength by the European cut-off.¹ Reference values by age group: times above 11.4 seconds at 60 to 69, 12.6 seconds at 70 to 79 and 14.8 seconds at 80 to 89 are worse than average.²⁵

2. The 30-second chair stand. Same chair (seat about 43 cm, or 17 inches, high),³⁰ arms crossed. Count how many full stands you manage in 30 seconds. The count tracks leg-press strength closely and gives consistent results when repeated,³¹ and a count below the age and sex thresholds in the tool below is below average and signals a higher risk of falls.³⁰ The reference values cover ages 60 to 94; below 60, use the five-rise cut-off above.

3. The 4-meter walk. Mark 4 meters (about 13 feet) on the floor and walk it at your usual pace. Taking 5 seconds or more means 0.8 m/s or slower, the speed EWGSOP2 uses to grade severe sarcopenia.¹ In adults over 65, every 0.1 m/s faster was linked to a 12% lower risk of death, and the authors suggest that speeds above 1.0 m/s may point to better than average life expectancy.³²

4. Grip strength (if you have a dynamometer). Under 27 kg (about 60 lb) for men or under 16 kg (about 35 lb) for women is low.¹ Results depend on the device, so use a calibrated dynamometer and the same protocol each time.¹

5. The SARC-F questionnaire. It scores the five tasks from the previous section from 0 to 2 points each; a total of 4 or more flags a higher risk.²⁷ It is a screen, not a test: in a review of many studies it missed roughly half or more of people who had sarcopenia, depending on the definition used,³³ so a good score is no reason to skip the chair test.

What to do with your results: if you pass everything, keep training to stay there. If you miss the European cut-off for five chair rises or grip, that already counts as probable sarcopenia: have it checked by your doctor, who can also look for other causes, and start the plan below alongside.¹ If only your 30-second count or your five-rise time is below average, start the plan and retest in 12 weeks. If you have fallen, your 4-meter walk takes 5 seconds or more, you miss several cut-offs or you score 4 or more on SARC-F, talk to your doctor before you start.

How doctors diagnose sarcopenia

The European EWGSOP2 pathway has four steps: find people at risk, assess strength, confirm low muscle quantity or quality, then grade severity by physical performance.^1,27 A family doctor can do the first two steps with a questionnaire, a grip dynamometer or a chair test; confirming it needs a measurement of muscle mass, in routine care with DXA (a low-dose X-ray scan) or a medical bioelectrical impedance device.¹

For muscle quantity, EWGSOP2 uses appendicular lean mass (the muscle in arms and legs) under 20 kg for men or 15 kg for women.¹ Severity is graded with a gait speed of 0.8 m/s or less, a Short Physical Performance Battery score of 8 or less, a Timed Up and Go (standing up, walking a short distance, turning and sitting down) of 20 seconds or more, or not finishing a 400-meter walk within six minutes.¹ The international ICFSR guideline suggests screening everyone aged 65 and over once a year or after a major health event, a conditional recommendation based on low-certainty evidence.⁴

Why muscle declines with age

Inactivity is a major cause, and one you can change. Experts from ESPEN, the European clinical nutrition society, name it as a major driver because it deepens anabolic resistance,⁷ the weaker response of older muscle to protein: resting muscle builds protein at the same rate as in young people but responds less to the amino acids in a meal.³⁴ In a small study, two weeks of cutting daily steps to about 1,400 made healthy 72-year-olds lose about 4% of their leg lean mass.³⁵

The other drivers are harder to influence:

• Nerves. The loss of motor neurons described above.²³
• Inflammation. People with sarcopenia have higher levels of CRP, a marker of low-grade inflammation, although cause and effect are unclear.³⁶
• Illness, injury and hospital stays. EWGSOP2 links acute sarcopenia mainly to an acute illness or injury,¹ and ten days in bed already cost measurable leg muscle (see the bed rest section).¹¹

Men: testosterone

Whether falling testosterone drives muscle loss is not settled, and treatment trials answer it only indirectly. Testosterone therapy gave healthy men 65 and over a moderate strength gain, but the effect shrank by more than half once a single study was removed,³⁷ and the ICFSR guideline makes no recommendation for hormones.⁴

Women: menopause

Women's muscle ages in its own pattern, possibly because of menopause: in a review of 32 studies, women after menopause had less muscle mass and strength than women before it, although the groups also differ in age.³⁸ Hormone therapy has not been shown to protect muscle: across 12 randomized trials in 4,474 women after menopause (mean age 59), it preserved lean mass no better than no therapy (low-certainty evidence).³⁹ On strength the studies disagree: an older analysis of 23 studies found about 5% more strength with hormone therapy, while a later one limited to 9 randomized trials with 2,476 women found no significant gain.^40,41 Whether hormone therapy suits you depends on its other benefits and risks, a decision to make with your doctor; for muscle, strength training is the lever the guideline backs.⁴

Preventing muscle loss with age

The European consensus sums up prevention as a lifelong project: build muscle when young, maintain it in midlife and minimize the loss in later life.¹ What works is covered below: the training plan and the right amount of protein.

What sarcopenia means for health and life expectancy

Sarcopenia is linked to a shorter life and more falls and fractures. Across 56 studies, people with sarcopenia had about twice the risk of death (hazard ratio 2.00), whatever definition was used.⁴² In prospective studies, people with sarcopenia had 1.89 times the odds of falling and 1.71 times the odds of a fracture.⁴³ In people living at home, sarcopenia was also linked to about a 40% higher risk of hospital admission, although the whole analysis rests on only five studies.⁴⁴

These are associations: illness can cause both muscle loss and early death. On the encouraging side, adults who do muscle-strengthening activities are 10% to 17% less likely to die or develop major chronic diseases in long-term studies, with the lowest risk at about 30 to 60 minutes a week.⁴⁵

Can you reverse sarcopenia?

Whether sarcopenia goes away completely is not something the studies reviewed here show. They do show that it can clearly improve: strength and function respond to training at every age studied, even past 80, and muscle mass responds too, but less.^46,3,47 In a small classic study without a control group, frail nursing-home residents aged about 90 nearly tripled their leg strength (plus 174% in the 9 of 10 who finished), and their thigh muscle grew by 9% in eight weeks of heavy training.⁴⁸ Across 47 studies in adults over 50, strength rose by about 24% to 33% depending on the exercise,⁸ and a typical program added about 1.1 kg (2.4 lb) of lean mass.⁹

Training still works after 75 and after 80, although it barely moves grip strength,³ which makes leg tests the better progress check. In 42 trials in people who already had sarcopenia, mostly over about 12 weeks, programs built on resistance exercise worked best: resistance plus balance training raised usual walking speed by about 0.16 m/s, and adding nutrition raised grip by about 4 kg.⁴⁷

The benefits reach daily life. In people aged 60 and over living at home, exercise programs cut the rate of falls by about 23% (high-certainty evidence), with balance and functional exercises carrying most of that effect.⁴⁹ In the LIFE trial of 1,635 sedentary 70- to 89-year-olds with physical limitations, a walking-plus-strength program lowered the risk of losing the ability to walk 400 meters by 18% over 2.6 years (30.1% vs 35.5% of participants).⁵⁰

The training plan that works

WHO advises every adult to train all major muscle groups on two or more days a week, and people over 65 to add balance and strength work on three or more days.⁵¹ For building and keeping muscle, the international ICFSR guideline is more specific: train two to three times a week, start with one to two sets of 8 to 12 repetitions at a light load, build to two to three sets at 70% to 80% of the most you could lift once, and add power work at 40% to 60%.⁵ In a meta-analysis of 25 trials in healthy people over 65, the settings linked to the largest strength gains, each analyzed on its own, were two sessions a week, two to three sets per exercise, seven to nine repetitions and 70% to 79% of that maximum.⁴⁶

You do not need to test your one-repetition maximum. The guideline pairs that load with sets of 8 to 12 repetitions that feel hard to very hard (15 to 18 on the Borg scale of perceived effort).⁵ In practice: pick a weight you can lift 8 to 12 times with good form and that feels hard to very hard by the last repetitions. Heavier loads build more maximal strength, but lighter loads improve everyday function about as well,⁵² so start where you are comfortable and make the weight heavier every week or two.

A balanced session covers the whole body in six to eight exercises:

• Legs: sit-to-stand from a chair (later a squat or leg press), step-ups, a hip hinge such as a Romanian deadlift
• Upper body: a row, a push (wall push-up, bench or chest press), an overhead press if your shoulders allow
• Daily life: a loaded carry (shopping bags or dumbbells) and calf raises
• Balance: standing on one leg, heel-to-toe walking

Once a movement feels solid, lift fast on purpose. Moving the weight up quickly and lowering it slowly trains power,⁵ the quality that fades first;¹⁹ power training added a modest extra gain in everyday function over slower strength training, although the evidence is low certainty.⁵³

Is walking enough? Walking is good for you and belongs in every week, but easy walking on its own does little for muscle. Aerobic training can probably build muscle only when it is demanding enough: one review names about 70% to 80% of heart-rate reserve (a hard effort that leaves you breathing heavily) for 30 to 45 minutes, four to five days a week, and most of the studies behind it used a bike.⁵⁴ An easy walking pace is unlikely to reach that. Combining cardio with strength training does not reduce gains in muscle size or maximal strength, though it can blunt explosive power, mainly when both are done in the same session.⁵⁵

Once you have built muscle, keep at least one session a week. In the six months after a year-long training study ended, people over 65 who kept training at least weekly preserved their thigh muscle better than those who stopped, while strength changed no differently between the two groups over that time.⁵⁶ More detail is in our strength training plan and our guide to building muscle after 50.

How much protein you need

For healthy people over 65, the PROT-AGE and ESPEN experts advise at least 1.0 to 1.2 g of protein per kg of body weight a day, which is 75 to 90 g for someone weighing 75 kg (165 lb); at least 1.2 g for people who exercise; and 1.2 to 1.5 g during illness.^6,7 Per meal, a lab study found that older men's muscle-building response maxed out at about 0.4 g of protein per kg (about 30 g for a 75 kg man), against 0.24 g per kg in young men.⁵⁷

More protein alone does not build muscle. When functionally limited men over 65 were assigned 1.3 instead of 0.8 g per kg for six months without training, they gained no more muscle, strength or function.⁵⁸ In a one-year trial in 208 healthy people over 65, whey or collagen supplements alone did nothing for muscle; only heavy strength training (taken with whey) preserved muscle and increased strength.¹⁰ Across 36 trials, supplements did not help people who were not frail and already ate enough protein.⁵⁹

Combined with training, extra protein added a small lean-mass gain, which in people 65 and over showed at total intakes of about 1.2 to 1.6 g per kg;⁶⁰ in studies of mostly younger adults, intakes above about 1.6 g per kg added nothing further.⁶¹ In line with this, the ICFSR guideline recommends resistance training strongly but protein only conditionally.⁴

Practical rules: put a protein source in each main meal (fish, poultry, eggs, dairy, tofu, beans, lentils), and add a protein-rich snack if your meals are small. If you have serious kidney disease, check with your doctor first: the PROT-AGE experts exclude people whose kidney function (eGFR) is below 30 mL/min/1.73 m² and who are not on dialysis.⁶ Our protein calculator gives you more detail for other goals.

Supplements: what the evidence supports

Creatine is the only supplement here with a consistent effect, on lean tissue, and it was studied together with strength training. In 22 trials whose participants averaged 57 to 70 years and trained two to three days a week, creatine added about 1.4 kg of lean tissue (part of it water) and small extra strength gains.⁶² The extra strength depended on studies that used a loading phase of 20 g a day or more for five to seven days.⁶³

The ICFSR guideline makes no recommendation for vitamin D against sarcopenia.⁴ Whether vitamin D helps muscle even in a clear deficiency is disputed,^64,65 and the strongest lever is not in a pill.

Losing weight without losing muscle, including GLP-1 drugs

When you lose weight, a share of it is lean mass,¹² and diet alone takes more than diet plus exercise. Across 52 studies in adults over 50 with overweight or obesity, fat-free mass made up at least 15% of the weight lost in 81% of the diet-only study groups, against 39% of the groups that also exercised (mostly aerobic exercise).²⁸ In a trial in 160 adults aged 65 and over with obesity who lost 9% of their weight, those who did resistance or combined training lost only 2% to 3% of their lean mass and gained 18% to 19% in strength, while the aerobic-only group lost 5% of lean mass and gained 4% in strength.²⁹

With weight-loss drugs, the lean share is similar to dieting alone overall. A 2026 analysis of 20 trials with 15,782 adults with overweight or obesity found that lean mass made up 35.2% of the weight lost with semaglutide, 25.4% with tirzepatide and 26.8% with liraglutide; taken together, the drugs were not clearly different from lifestyle programs alone (26.2%). Lifestyle change plus resistance training had the best ratio, 17.5%, although these comparisons are across different trials.¹²

One caveat: “lean mass” also counts organs and water, and reported shares range from about 15% to 60%,¹⁷ so these drugs do not simply “melt muscle”.

If you are losing weight, with or without medication: strength-train two to three times a week, eat at least 1.2 g of protein per kg a day unless your doctor advises otherwise,⁶ and retest your chair stand every few weeks. Never change a prescribed medication without your doctor. Our guide to strength training for weight loss has the training side in detail.

After a hospital stay or bed rest

Bed rest takes muscle remarkably fast. Healthy older adults lost 0.95 kg (about 2 lb) of leg lean mass in just 10 days, more than twice what young adults lost in 28 days in a separate study.¹¹ In a small study of healthy people around 67, 10 days in bed also cut knee strength by about 13% and stair-climbing power by 14%.⁶⁸

Recovery takes longer than the loss. After 14 days of bed rest, men aged 55 to 65 lost 8% of their thigh muscle, and two weeks of rehabilitation did not fully restore it.⁶⁹ After two weeks with a leg in a cast and four weeks of retraining, older men regained their strength but rebuilt less muscle than young men.⁷⁰

What helps, with your care team's agreement: get up and walk as early as you are allowed, do sets of sit-to-stands and calf raises several times a day, eat 1.2 to 1.5 g of protein per kg while you are ill,⁷ and restart progressive strength training as soon as you are cleared. Expect strength to come back before muscle size does,⁷⁰ while power can take longer.⁶⁹

When to see a doctor

Frequently asked questions

What is the best treatment for sarcopenia?

Strength training two to three times a week that gets heavier as it gets easier,⁵ plus enough protein: for healthy people over 65, at least 1.0 to 1.2 g per kg of body weight a day.^6,7 The international ICFSR guideline recommends resistance training strongly and protein only conditionally.⁴

At what age does muscle loss start?

An autopsy study of one thigh muscle in 43 men found that fiber loss can begin around 25,²¹ but muscle loss adds up slowly: studies comparing young adults with people over 65 find a median of 0.37% to 0.47% of muscle a year.² Beyond 50, leg muscle has been reported to fall 1% to 2% a year.¹ Grip strength peaks between about 26 and 42 and declines from midlife.²⁴

Can a 70-year-old build muscle?

Yes. Strength training adds about 1.1 kg of lean mass in adults over 50 on average,⁹ and it still builds strength and muscle after 75.³

What vitamin helps against muscle loss?

Vitamin D may help strength a little if you are clearly deficient,⁶⁴ but a review of 54 trials found no benefit for strength or mass, even in people with low levels.⁶⁵ Training and enough protein matter far more.

Is walking enough to prevent sarcopenia?

Not on its own. Walking helps your heart, but easy walking is unlikely to reach the intensity that builds muscle;⁵⁴ add strength training two to three times a week.⁵

Which doctor diagnoses sarcopenia?

Your family doctor can screen you with a questionnaire, grip strength or the chair test.¹ Confirming it needs a measurement of muscle mass by DXA or medical bioelectrical impedance,¹ which your doctor can arrange, if needed through a geriatrics clinic.

What is the ICD-10 code for sarcopenia?

In the United States it is ICD-10-CM M62.84, in use since 2016.¹⁶ Germany has no separate code and lists sarcopenia under M62.5-.⁷¹

Does sarcopenia shorten life expectancy?

In studies, people with sarcopenia had about twice the risk of death,⁴² but that is an average across many people, often already ill. Strength training is linked to a lower risk of death.⁴⁵

References