My youngest character is Gilravock at age 16 But Grippli, his species, have a different lifespan, and so he's been fully mature for the last four years. (A human equivalent would be ~20's-30's)
Aside from that, most of my characters range from mid 20's, 30's, and 40's. My oldest characters being immortal or brought back to life in pretty much every case. My immortals, undead, and semi-immortals are all around 100, with the exception of one 4000+ year old vampire.
Hara is considered the oldest, as he is a demon born thousands of years ago.