I just found out that Virgil Donati was born in 1957, making him 49 years old! Did anyone know this? It came as a shock to me because I always thought that he was young and at most in his late thirties. His playing hasn't slowed down at least.
Q, check out Roy Haynes sometime - 82 (IIRC), and still one of the top jazz drummers on the planet. (One of the top drummers - period - for that matter...)
I'm not sure how young he was when he started playing, but he has been working professionally since the mid-1940s, according to this biography (and others I've found):