Why not? He’s been in the league since he was 19. Lots of mileage. A five year old car with 200,000 miles on it is an “old” five year old car nonetheless.
Even a minor slip in physical ability will affect reflexes , timing , etc...
It’s like a skater losing half a step , makes a difference .
I think those knee and hip injuries may have taken a toll as well as his mental state .