No, the only way they can bust them is if they say they are under 13 in a post, and many do because they want to hook up with others their own age. I think only way to monitor age is to require a credit card number for membership.
Hate to answer a question with a question, but is this site for kids looking for help with their homework? It's a great concept, but it seems like a bunch of kids. Not that there is anything wrong with it, but where is this kind of site for adults?