Hi Q Factor,
Most established good drummers who earn their living with drumming are 40 plus.
It is a blessing that, providing you look after yourself, you can be an old AND a very good drummer!! (I would say that would'nt I)
That is why we still have the luxury to enjoy the great ones like Simon Phillips, Steve Gadd, Joe Morello, Stewart Copeland, Bermuda, Billy Ward, etc.etc. I mean many,many more, thousands!!!
I still have a ball with the drumming, and I think the music is such a wonderful fullfilment for my never waning aspirations. I play in a couple of bands and I am by far the oldest, but nobody seems to have noticed yet
Drummers grow old, there is no doubt about it, more so than the musicians who play "the other" instruments, BUT, The Conductors of orchestras live longest!!
Cheers and Happy Drumming,
Harry