Age doesn't matter in a forum, but there are times that when you run a forum with minors registering, especially with kiddie forums and stuff, you will have to deal with the feds if your site's based in the US, you know, the COPPA rules, also known as the Children's Online Privacy Protection stuff? But then, again, as long as you're mentally mature enough, and you don't act noobishly, it's OK to join and have fun here...