How to Prevent Muscle Loss as You Age

A woman in her late 60s told her doctor she felt like she was getting scrawnier every year. She walks, does yoga, lifts weights twice a week. She was doing everything she was supposed to do, and the muscle kept slipping away anyway. Sports medicine physician Dr. Jordan Metzl opened a recent column in the Washington Post with her story, and I haven’t been able to stop thinking about it, because I’ve heard some version of that sentence from nearly everyone I know over 60. The condition has a name most people never hear until it applies to them: sarcopenia, the age-related loss of muscle mass and strength. Metzl’s argument is that the decline is real and also far more negotiable than the just-getting-old story we tell about it.

It starts earlier than you would guess. After age 30, adults lose somewhere between 3% and 8% of their muscle mass per decade, and the rate nearly doubles after 70, up to 15% per decade (Harvard Health Publishing, 2016). About 7% of people in their 40s already meet the criteria for sarcopenia. Past 80, it’s more than 36% (Petermann-Rocha et al., 2022, Journal of Cachexia, Sarcopenia and Muscle). Left alone, most men lose roughly 30% of their muscle over a lifetime. Your 40s are when this quietly begins, which is also the decade nobody is thinking about it.

Muscle isn’t only for lifting things. It’s metabolically active tissue. It helps regulate blood sugar, it keeps inflammation in check, and it’s the reserve your body raids when you’re sick or recovering from surgery. As muscle goes, so does metabolic health and independence, while fall and fracture risk climbs. The number that got my attention comes from the PURE study, which followed nearly 140,000 adults across 17 countries: every 5-kilogram drop in grip strength was tied to a 16% higher risk of dying from any cause, which made grip strength a better predictor of mortality than blood pressure (Leong et al., 2015, The Lancet). A hand dynamometer out-predicting a blood pressure cuff. I still find that hard to shake.

So why does the same routine to keep my muscles fully functioning stop delivering? Metzl points to a process called anabolic resistance. Aging muscle responds less to training and less to dietary protein. Fast-twitch fibers, the ones you use to sprint or to catch yourself when you trip on a curb, fade faster than the rest, and motor units get sloppier. The useful part of that finding is what it doesn’t say. The muscle hasn’t stopped listening. It needs you to talk louder.

Older muscle adapts, and the evidence isn’t limited to healthy 60-year-olds who already like the gym. In 1990, researchers put frail nursing home residents averaging 90 years of age through eight weeks of high-intensity resistance training. Leg strength went up an average of 174% (Fiatarone et al., 1990, JAMA). A later trial in very frail nursing home residents paired resistance training with nutritional supplementation and again produced real strength and mobility gains in people in their late 80s and 90s (Fiatarone et al., 1994, New England Journal of Medicine). Thirty-five years on, that first study is still the one I’d hand to anyone convinced they’ve missed their window.

Metzl’s prescription comes down to four things. Resistance training has to be consistent: two to four sessions a week, whole body, built around squat, hinge, push, and pull, with the weight or the difficulty creeping up over time. Walking and yoga earn their place for balance, mobility, and cardiovascular health. What these activities don’t do is load the muscle hard enough to reverse sarcopenia, and I suspect a lot of people are quietly counting on them to.

Protein intake needs rise with age rather than fall. Older muscle is less sensitive to protein’s signal to rebuild, so it takes more of it, more often, to get the response a 25-year-old gets from an ordinary lunch. Metzl suggests 25 to 35 grams per meal, two or three times a day. The PROT-AGE Study Group’s consensus guidelines land in the same place: at least 1.0 to 1.2 grams of protein per kilogram of body weight daily for adults over 65, more for people who are active or managing illness, with roughly 25 to 30 grams per meal to clear the anabolic threshold that triggers repair (Bauer et al., 2013).

Recovery is part of the treatment, not a break from it. Muscle rebuilds after training, not during it. Older adults who add volume without adding rest tend to collect injuries like stress fractures instead of strength. Recovery means enough total calories to fuel the adaptation, not protein alone, and at least seven hours of sleep, since a good share of the repair happens overnight.

Supplements work at the margins, which isn’t the same as not working. Creatine monohydrate has better evidence behind it than almost anything else sold to older adults. A meta-analysis of controlled trials found that adding creatine to resistance training produced greater gains in lean mass and lower-body strength than training alone (Chilibeck et al., 2017, Open Access Journal of Sports Medicine). Metzl is more skeptical of the peptides and hormone therapies currently being marketed for aging muscle, and on that I’d agree with him: the evidence is thin and largely investigational. Nothing yet replaces mechanical load. A few supplements support the work; they don’t stand in for it.

What stays with me is the question underneath the column. How much of this decline is normal aging, and how much is a prophecy people end up fulfilling? If you believe muscle loss is inevitable, and your usual routine stops showing results, the rational response is to do less of it. That’s exactly the wrong move, and it speeds up the thing you were afraid of in the first place. Muscle remains one of the most trainable tissues in the body at any age, provided you load it, feed it, and let it recover. Getting scrawnier isn’t your fate. It’s a dose.