Originally Posted by grindy

Just some guys who quickly come to mind:
Peter Brötzmann, a free jazz saxophone player, is now in his seventies. He has released some great music in the last decade and I've seen him live several times. He is not slowing down.
Phil Minton a very diverse singer and trumpet player, but mostly known for his free improv music, is 74 and he keeps exploring and playing great concerts.
Fred Frith is now in his sixties and he is as creative as ever, whether as a composer or as a performer.
John Zorn and the whole downtown scene are in their sixties as well and those guys are still a cornucopia of creativity.
Keiji Haino whose work is partly really free psychedelic rock and partly entirely uncategorizable is in his sixties now and some of his best work is from the last years.
I really enjoyed Scott Walkers recent collaboration with Sunn O and he is 71 now.
It goes on and on.