After age 50, the body slowly loses muscle mass: a process called sarcopenia: and becomes more resistant to the muscle-building signal of dietary protein. The good news: you can offset most of it with adequate protein and resistance training. The picks below are all easy-digesting whey isolates and slow-release caseins with low sugar, gentle on the stomach, and clean enough for daily use. Ranked by value across 12 US retailers.
The standard RDA of 0.8g/kg is set for nitrogen balance in young adults: and is widely considered too low for older adults. The PROT-AGE expert group and Bauer et al. recommend 1.2 to 1.6 grams per kg of bodyweight per day for adults over 65 to prevent sarcopenia and preserve function.
Spread protein across 3–4 meals of 25–40g each: older muscle responds better to larger per-meal doses (this is "anabolic resistance"). A 25g whey isolate scoop at breakfast and a casein scoop before bed makes hitting the target effortless, especially when appetite drops with age.
Yes: for healthy older adults, supplemental whey is just concentrated milk protein. The main caveat is anyone with diagnosed kidney disease should follow their doctor's protein limits. Otherwise, multiple randomised trials in adults 60+ show whey supplementation (around 20–25g daily) improves muscle mass and strength alongside resistance training.
Use both. Whey isolate digests fast and is excellent in the morning or after walks/strength sessions to trigger muscle protein synthesis. Casein digests slowly over 5–7 hours and is ideal pre-bed: overnight is when muscle loss is highest in seniors, and casein blunts that nicely.
Pure whey isolate has under 1g of lactose per scoop and is well tolerated by most people who are mildly lactose-intolerant. If concentrate gives you bloating, switch to an isolate (Dymatize ISO100, Isopure, Naked Whey). If dairy is off the table entirely, our /for/vegans/ page has gentle pea+rice options.
Not strictly: but it makes hitting 1.2–1.6g/kg far easier when appetite is reduced. Many older adults struggle to chew enough lean meat or fish to hit their daily target. A shake delivers 25g of high-quality protein in seconds, with no cooking, no portion stress, and no expensive cuts of meat.