Dont know if its appropriate to post that my brother just turned 13 today (he isnt on the forums, in fact, he finds this to be something he makes fun of), but he is 13, and not very smart, but maybe it would make him feel like a jerk if you said happy birthday.
oh, on the other hand, my cousin out in AZ is turning 15 today, and he (quite the opposite) loves this stuff, he went to comic con last month, and im trying to get him to join.
oh my brothers name is marc, if you care.