Who are they?
As an example, growing up it always seemed Green Arrow was 8-10 years older than the other Leaguers (maybe owing to the bears). His origin seemed to line up w. that, as it seemed he was already in his thirties when he came back from the island where he acquired his archery skills, and then decided to play hero.
I know immortal/long lived characters would all prob. be correct answers (and if there’s a really good example one that’s great) but I was thinking more of folks who age normally.