User blog comment:Romerox/How many years will be calculated for each of the characters/@comment-3035387-20101219175938/@comment-3251190-20110112002547

Carl doesn't look or act like he's twenty. He's 15-16.

Kids (Phin, Ferb, Izzy, etc): 10

Teens (Candy, Stacy, Jenny, etc): 15 (possibly 16 for Vanessa and Carl)

The end.