The thing that changes with age
Muscle protein synthesis becomes less responsive as you get older. The practical consequence isn't that you need dramatically more protein, it's that you need it more evenly, because a smaller dose gets less of a response than it used to.
Most people eat the classic pattern: almost nothing at breakfast, a modest lunch, and most of the day's protein at dinner. That works less well at 50 than it did at 25, and it's one of the more fixable things in an active adult's diet.
What better distribution looks like
Roughly even servings across three or four meals, each substantial enough to trigger a response, rather than one large evening load. For most people this means the change happens at breakfast, which is where the gap usually is.
This isn't a call for shakes. Eggs, dairy, fish, and leftovers from last night all work. The mechanism doesn't care whether it arrived in a bottle.
Connective tissue is a separate problem
Muscle and tendon respond to different things. Collagen with vitamin C, taken near loading, targets connective tissue specifically, and connective tissue is usually where the recurring niggles live in people who train consistently into their forties and fifties.
The part people skip
None of this outperforms not getting hurt. Progressive loading, increases small enough that tissue adapts rather than complains, does more for long-term strength than any nutritional adjustment on this page. The nutrition supports the loading. It doesn't rescue you from a bad jump in volume.
Working on this yourself? This is ground PATH Recovery covers over its twelve weeks. If you'd like someone looking at your actual week rather than general advice, that's what the coaching is.
This article is general education for healthy adults. It isn't medical advice and it isn't a substitute for your own doctor or provider. If something's persistent, painful, or new and unexplained, get it looked at.