You know how in most fields like business, people's careers peak when they're around 50 or so? Well, it seems that most concept artists at the top are in their 20's, perhaps as old as... their 30's! (Now, I know there are exceptions, so before I get 5 "ever heard of
syd mead?" or "I'm X years old and I still do concept work" or "The famous artist X did his best work when he was young"...