In martial arts, we say “time is undefeated.” Obviously, fighting another person is a much more physically demanding and takes a much heavier toll on the body than playing an instrument.
I know it’s not what you’re implying, but I think it’s hard to attribute Steve Morse’s issues with his particular technique as some people often do.
He has lived an active lifestyle and has been injured in other pursuits. Yngwie Malmsteen famously damaged his picking wrist in a car crash, and Steve Vai suffered a severe bacterial infection in his picking arm.
It’s also possible that every picking technique carries some risk of wear and tear, and Steve Morse has probably picked more notes than anybody else alive.
A little over two years ago I dislocated and tore my right shoulder. It feels fine now (I’m 33) and doesn’t impact my guitar playing at all, but how will it feel when I’m in my late sixties?