Also just because someone is 15 doesn't mean they can't be a mod.If he acts mature enough then there is nothing wrong with him being a moderator and yes it is against the rules to make threads about particular people on AG.
He should still be a mod, he helps out with a lot of stuff. And like everyone said, it's maturity that counts. He could be 12 and he would still be a mod if he acted like he does now.