Had a quick look about. Not sure if it's even been set yet. Just keep checking the AI website or could always try the forum for it:http://z7.invisionfree.com/Ai500
I think it might be like 12 with parentaly supervision.... But saying that all the videos i have seen on it i havnt seen a kid in it.... Might be 18+ becuase of Insurance....
Tell ya what i will dig deep in my AI libary and find out for ya