I agree with all the comments that most of the younger ones who post just to see their ranks go up, eventually go away.
Ye must admit though that sometimes we get some younger ones 14-16 years or so, who are into either Pirates, Ren Faires, or other subjects here, where they are eager to learn more, and also have thier own experiences to share. We need to help nurture those youngens, so their interests don't fade, the way we want the "post-happy" ones to.