My characters tend to be adults, really. Maybe it's because I've read so many books and played so many games in which the main characters were all teenagers - I just got tired of it. I've got a couple of teenaged characters kicking around in my various ideas, but most of the main players tend to be adults - and it's been that way pretty much since I started making stories. At age 7.
... I was a weird kid.
I'm 27, and here's my list (which is not exact; I haven't set anything in stone):
Grassblades (action-adventure/fantasy): Masahiro is somewhere between 32-36 (I haven't decided), Akane is probably less than 6. Chouko is 29-30, Dateh is 35, Kazue is 23-ish, Lady Watanabe is approaching 70, her attendant Ying is in her late 20s, and our favourite hapless bandits Ichi, Ni and San are 30, 27 and 25, respectively.
Wishlight (fairytale/fantasy): The main character is about 15, her mother is in her late 30s/early 40s, and the other principal character is ageless, but looks about 35-ish?