not aging = not wasting any xp on ANY magic stuff.
Ive made a char purely based on magic, and he was old. All my other stats (phys, health, toughness, guile, speed, acurecy) where 1.
So just keep it to the warriors side to stay young :P
or...
USE A TRAINER
simply click: age 18 / 21 / 30 / 40 / 60
done