Clinical guidelines for healthy aging recommend adults 65 and older get at least 1.0 to 1.2 grams of protein per kilogram of body weight every day — more if you're sick, recovering, or regularly active. For someone who weighs 150 pounds (68 kg), that works out to roughly 68 to 82 grams a day at the floor, and the biological shift behind that number starts phasing in well before 65.
| Who | Recommended daily protein | Example at 150 lb (68 kg) |
|---|---|---|
| Generally healthy adults 65+ | 1.0–1.2 g/kg body weight (about 0.45–0.55 g/lb) | 68–82 g |
| Adults 65+ who exercise regularly | At least 1.2 g/kg (about 0.55 g/lb) | At least 82 g |
| Adults 65+ with an acute or chronic illness | 1.2–1.5 g/kg (about 0.55–0.68 g/lb) | 82–102 g |
| Adults with severe kidney disease, not on dialysis | Lower, set individually | A clinician's call |
These ranges come from the PROT-AGE Study Group's 2013 consensus recommendations for older adults.¹
Why does the recommendation target 65, when the question is about 50?
Because that's the age range the main clinical consensus statement on this topic actually covers — and it's worth being precise about that rather than stretching the citation to fit a rounder number. The biology behind the guidance, though, doesn't wait for a birthday. Two things change gradually through midlife and keep changing after: "anabolic resistance," where the same amount of protein triggers less muscle-building response than it used to, and higher "splanchnic extraction," where more of the protein you eat gets used by the gut and liver before it ever reaches your muscles. Both make a given gram of protein less effective at maintaining muscle as you age, which is why many clinicians treat the 50s as a reasonable point to start aiming at the higher end of general adult protein intake, rather than waiting until a specific cutoff.
Does it matter when you eat your protein, not just how much?
There's evidence it does. In a controlled feeding study, researchers gave eight healthy adults the same total daily protein two different ways across separate week-long periods: spread evenly across breakfast, lunch, and dinner, or skewed heavily toward dinner the way a typical Western diet often is. Using tracer techniques to measure muscle protein synthesis directly, they found the evenly distributed pattern produced a 24-hour muscle-building response 25% higher than the skewed pattern — and the difference held up after a week of getting used to each diet, not just on day one.
That's a meaningful signal, with two real limits. The study was small — eight people — and its subjects averaged about 37 years old, not specifically older adults, so the trial itself doesn't prove the distribution effect is larger (or smaller) after 50. What it does show is a mechanism — your body can only put so much protein to use in a single sitting — that lines up with the same anabolic-resistance story behind the age-65 recommendation above. Spreading protein across the day is a reasonable precaution for the same reason raising the total is: neither has been tested specifically in a 50-to-65-year-old population, but both follow from the same biology.
What if a medical condition limits how much protein is safe?
For most older adults, more protein within these ranges is not a safety concern. The one named exception in the clinical guidance is severe chronic kidney disease — specifically an estimated glomerular filtration rate under 30 that hasn't progressed to dialysis — where higher protein intake can place extra strain on kidneys that are already struggling to filter waste. That's an individualized call a clinician makes by looking at your actual kidney function, not a reason for someone with healthy kidneys to under-eat protein out of caution that doesn't apply to them.
What the research says
Bauer and colleagues, writing for the PROT-AGE Study Group, recommended that healthy adults over 65 average at least 1.0 to 1.2 grams of protein per kilogram of body weight daily, rising to 1.2 grams or more for those who exercise regularly and 1.2 to 1.5 grams for most older adults managing an acute or chronic illness, while flagging severe kidney disease as an exception requiring individualized limits.¹ This is a consensus position paper from an international panel reviewing the existing evidence, not a single clinical trial — its strength is synthesizing a wide body of research, and its stated age range is 65 and older, not 50.
Mamerow and colleagues found that among eight healthy adults averaging 36.9 years old, distributing protein evenly across three meals produced a 24-hour muscle protein synthesis rate 25% higher than concentrating the same total protein at dinner, a difference that persisted after a week on each diet pattern.² The trial is small, measured a short-term biological marker rather than long-term changes in muscle mass or strength, and did not specifically study older adults — so the finding establishes that distribution matters in principle, not how large that effect is after 50.
What you can do this week
- Calculate your own target. Pallas's free protein calculator turns the per-kilogram ranges above into a daily gram target for your own weight, so you're not doing the math by hand.
- Spread protein across your day instead of loading it at dinner. A protein-forward breakfast — eggs, Greek yogurt, cottage cheese — closes most of the gap between a typical skewed eating pattern and an even one.
- Don't assume illness or a smaller appetite means you need less protein. The clinical guidance points the opposite way: older adults recovering from illness generally need more protein, right when eating enough of it is hardest.
A target you don't act on doesn't do anything for your muscle. The number above is the floor worth building a week of meals around.
