Of course everyone is different & he will be fine.You’ll be fine, man. Everyone is different. Experience is relative and perspective liberates. My grandpa is nearing 100 and the guy is more productive than many 20/30 year olds I know, lol. The key is passion. Love doing something and you will have a reason to be strong. Not perfect. Not the past. Strong. ✌🏽
But people do start to feel things with age. Doesn’t mean they should stop or give up.
I love combat sports. I retired from them, but still do them daily. Still run half marathons, swim laps, etc…
But simply swimming a mile now and then running a 10k afterwards hurts a lot now. I have to prepare for it (sleep, hydration, carbs, etc…) when I was in the military I would do twice a that a day with no preparation and not feel a thing afterwards.
Doesn’t mean I will ever stop.
Just means I have to prepare for it now & it hurts infinitely more than it used to.