When the new cut came in

I had to bribe him to have a haircut yesterday, because he thought haircut was annoying and boring and totally waste of time. You know how many math problems I can solve in those 15 minutes, mom?

So in exchange for sitting through the haircut, I gave him 600 Jelly Beans and let him watch 200 episodes of Pokémon. Oh, and of course I had to remind him about the bribe 3,000 times during the haircut.

All is done now, except when did he turn 18 years old?