Depends how much damage you did earlier in life.
For me I was still pretty active at 50, but by 55, I slowed down quite a bit.
I think it was more mental than physical because of all my wifes health problems and taking care of her.
Did physical therapy this year for the arthritis in my shoulder that I broke back when I was 20. That helped alot.
Presbyopia (old age eyes) make it harder to focus on items close up.