Most of my characters are in their 20's. Only (half backed) exeption is Pyrus, who's body stopped aging after he mutated. So his body is still that of a 26 year old but if you would keep counting the years he'd be over 80...
Scatman McJones is 60
The Snide is 25
The others I haven't thought about (except Stoof, whose 20 'cos he's me 
)
Taki is 11, member of Battle Royale. You can join the group if you have a small, young char as all other members are also school-kinds around the age of 12. Our leader is 13- she's quite mean 
Well, the Foolkiller is 27. Technically, he will stay 27 for a very long time. He mostly consits of constantly reproducing energy and the 'fleshy hull' around it corresponds to his image of himself. He doesn't know that, though, and still believes his powers are too strong to control and will damage him if he isn't holding them back. ^^;
Dr. Eclipse is 36 and still searching for a spell that will provide him with immortality.
Morgan the Fate is 352, having the natural life span of a demon (being a half-breed, and all)
Bad guys
Ms Behave is 17, Purple fiend is 10,000, Robotella is 2.
Good guys.
Col Savannah is 25, Hoodaman is 75, Gonn Fission is 32
Maya/Twilight Archer will be 21 soon even if she behaves like a 16 year-old.
Kiah/Lady Excelsior is 16 or 17, I have yet to pick one or the other.
Light Bringer is mid-20s. Much background still undecided.
Denise/Star Jewel, 25 Years (almost 26)
Nathalie/Precious, 19 Years
Dr. Marks/Synchronus, 32 Years
Dennis/Starhunter, 26 Years
Hero: Star Jewel(50)
Associates: Gemstone; Storm Lock; Star Sparkle; Dawnshade; Lunara; ...more
Enemies: Shadow Vine; Tirana Q; Forte Cadenza; Black Ion; Pursuit; ...more
Hell Kitty: Hmmm probably around 23, gets complicated when your a cat....the humanoid....
Entropy Kitty: Doesn't matter what my age is, your face is still going to end up concave.
We talking bout age or levels? I'm baffled 
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Age, as in how old your character is.
Mine (the humans at least) range from 14 (Little Miss Stinger) to 45 (Johnny Clean). Pandaemonia is several millennia old, and has never regarded chronological age as important anyway.
Soul Warden / Spirit Warden- I haven't RPed with them yet, so I haven't really though about it. But I guess they are a lot older than they look. I'd say between 200 and 300 years.
Crimson Assassin looks to be 25, but might be a year or two older (you can never tell with her).
Unknown Phantom (with whom I want to RP, but haven't gotten a chance yet, as he's a new char) is... well, he probably knows his age, but it's hard to get it out of him as he doesn't speak at all. He only gesticulates and sometimes throws images into the heads of others. (Oh yes, RPing with him might be hard, I can already tell 
)
Green Beret is in his late 40s. He's in good shape though (Ahh, those daily excercises).
Tech Assassin- the body itself is rather new as far as cyber bodies go; roughly 8 months old. But the brain that operates it is a lot older; probably late 50s.
The Greenhouse project- He's 21 (the controled mutation being recent). But he'll look 21 in 50 years as well.
The Electron Kid is 15 yrs old, and is still getting used to having his powers, but having former SuperHero parents kinda helps! LOL
Formerly @Crimson Archer, now @CA
The Militia - Protecting Paragon City through roleplaying since June 2006!
Dark is 38 going on 39.
Inago is 16. I dont really have any permanant alts at the moment so I wont bother listing anymore.
Captain Solaris - Technically he should be about 78 years old or so. But working with the Government in his late 20s catapulted from the 50s to this decade after a botched experiment.
Earth - In his natural origin, he was only a teenager when he was sent hurling through space before landing on our planet. Age unknown, however looks about the same age as a typical 25 year old male would look like.
Gabriel Knight - Mid-thirties archeologist. After being bound with the demon Alouqua, it is believed he is the incarnation of the champion that slew her centuries ago.
Eternal Light - Early twenties. Martial Art's prodigy from an early age, his talents excelled when he reached puberty due to his mutant origin.
Terrax - Kheldian refugee. After being saved and released from his Quantum prison by the hero Earth. Despite his true age being unknown, his human form identity is the image of a typical 30 year old male.
Urubach - Over a milennia old, Urubach is a mischievious demon commander of the dead.
@Captain Solaris
Guild of Extreme Heroes "Strength is in Unity"
I'd say late thirties, early forties...
Mother's Love was conceived as appearing the very instant a Mother felt a Mother's Love for her newborn child!.....so pretty old then!, which probably explains her appearance in-game.
Hmmm, beter start with the oldest then.
The Mad Leprechaun, Fergus O'Reilley. Fersus will be roughly 4000 years old.
Cuchullain is roughly 2100 years old
Dark Rose is 19 physically
Bluestrike is 18
Monster. Adam is 180 years old
Mister Giggles is in his 30s
Shanghai Blue will be roughly 29.
Well, I have two real characters I use.
Pagophyte, the Science Corruptor, is probably in his late 20's, early 30's.
Rufus Navitas on the other hand, the Technology Dominator, is around 80, but has altered his body and arsenal to become fit for anything. Only his eyes show his weak old self.
Aluria, or Stargazer, is 28.
Elizabeth, or Shadow's Grace, is 898 now.
Sam, or Mindblank, is 17.
And Rose, or Areulder, is 25.