Bottom line is the older you get, the more protein you need.
Older? Need more protein? I’ll take that under advisement. Being well past 80 I’ll start cutting my rib steaks thicker. That oughta do it! I’ll let my meat packer guy know I only want rib loins from full grown cows. No more of that grass fed low fat stuff, not that I would have bought it anyway.
Exercise does not hurt either. Got one of those spring loaded gadget for building arms, back and upper chest. It’s a monster but you have to keep at it to keep the muscle mass.
True about the protein. After 60 your Leucine levels fall. Leucine is needed for utilizing that protein. I started taking supplements a month ago - big diff.