It's no surprise that many NBA stars remain their athleticism deep into their lives. A person like MIchael Jordan is not built like the rest of us — he will get less springy as time goes on, but he will still dunk at 50 years old. My athletic peak, on the other hand, involved chipping in from the grass during a round of miniature golf (with the putter, though!).
Longtime coach Alvin Gentry did not play in the NBA, although he did letter at Appalachian State and appears to keep himself in excellent physical condition. Nevertheless, the current Golden Warriors associate head coach and soon-to-be New Orleans Pelicans head coach can still dunk at 60.