No. The lowest possible age category for anything but a true dragon is adult, and the game doesn't care whether you're 0 or 12 or 20 so long as you're still within the adult age category for your race.
Originally Posted by JaronK
Frankly, a Wizard can suck even more than a Fighter could ever dream of sucking. A Fighter can stab himself to death, but only a Wizard could Plane Shift to some horrible far realm to be tortured for an eternity of insanity.