OneDumbG0
Find Your Own Fire
Marvel does a great job with character aging.
1) Spidey got his powers at fifteen and he's graduated high school, graduated college and was teaching high school students before the New Avengers sent his normal life into a tailspin.
2) Punisher is nearing his fifties in current Punisher. Granted, some of the artists make him look like he's thirty-something, but Ennis' origin still places Punisher's roots in the Nam. If you read Marvel Max Punisher, especially 1-6 storyline 'In The Beginning,' you see a depiction of the Punisher that makes him look old and grizzled. Very few Marvel Max Punisher artists make Punisher look young. He still mentions the Nam in Marvel Max Punisher. He's one of the few Marvel characters who have properly aged, although his mainstream appearances sometimes don't reflect it like Civil War.
3) Captain America was defrozen in the early 80's. Any Cap stories set before then were explained through other Captain Americas who took his mantle, especially during the 70's and the Red Scare period. It's a pretty nifty story that hasn't been shyed away from since Brubaker talks about it in his current Cap comics. There have been two Captain Americas between WWII and Roger's rebirth.
4) Magneto keeps showing up in muscled bodies because his bodies keep getting replaced, via mind transfer or clones. He always had white hair even as a young man. But yeah... he's been around for a while.
5) Xavier also has had body tampering done also. So while he's been around, his current body is most definitely not his original.
6) Remember, the original X-Men like Cyclops and Beast and Iceman were all teenagers when they started. They're all at least in their early thirties, so that bit of aging isn't to be scoffed at.
7) Namor's been active since WWII and disappeared for a bunch of years when he was a hobo, but being a half-breed, just because he looks young, doesn't mean he is young. He's still got all those years under his belt.
8) Matt Murdock was a fresh attorney out of law school when he started as DD which puts him at maybe 23-24 when he started and most definitely years have rolled by to the current DD who's had an accomplished practice and is now cooling his jets in prison. He's probably the one character that hasn't aged as much as he probably should have. He really should be in his early forties now, but he's probably in his early thirties at most.
9) But for every DD, there's a Shadowcat. Kitty Pryde was thirteen when she was introduced in the 1976? She's in her mid twenties at the least now and maturing quite nicely. (Just a disturbing note to others, Colossus was messing around with Kitty at this age. Talk about jailbite and liking em young...)
I can't really think of characters who haven't shown a decent amount of aging since their start and who peculiarly lack explanations about it. Although there is a reduction in time and a few retcons and Spiderman has not aged 30+ years from 1963-2006, he's aged a good 15+ years since then. That's not bad. The only hackoff I have with Marvel is how they keep bringing dead characters back to life. Colossus, Aunt May, Dr. Octopus... gawd. Jeez, leave a character in the frigging ground unless you're doing something really cool with it like Bucky. Winter Soldier pwns. Well... at least Uncle Ben, Mar-vell and Jean Grey are still dead. I'm very happy with the latter since that Phoenix storyline was being beaten to death.