As we age, the anabolic response to protein decreases, so it is recommended to gradually increase protein intake by approximately 1% per year after age 40 (up to a ceiling of about 2.4 g/kg).

noli's read

Science does indeed confirm the 'anabolic resistance' phenomenon, in which the bodies of older individuals become less efficient at stimulating muscle protein synthesis after a meal (meta-analysis, Moore et al., 2015). To compensate, increasing the protein dose per meal is a strategy recognized as effective for optimizing muscle retention (RCT, Phillips et al., 2013). The specific suggestion to add 1% per year is, however, an empirical and pragmatic approach from the creator, rather than a figure set in stone by a rigid scientific consensus. Research validates that requirements are higher in seniors than in young adults (expert opinion, PROT-AGE Study Group), but the precise calculation remains subject to individual interpretation. The suggested ceiling avoids unnecessary excess while securing optimal intake. It is a prudent recommendation that aligns well with the goal of preserving muscle mass over time.

the sources

No named source held this one up — that absence is part of the verdict.