Is there an age minimum for the adult (Silverball Rumble) tournament? My 7 year old son wants to play but I feel he's way too good for the kids tourney (eg. he's beaten Deadpool, Medieval Madness, and Iron Maiden and just put up 1.4b on Godzilla the day after we got it). I didn't want to take him only to find out you have to be 18 and it's not fair to the other kids to put him in the kids tourney so just wanted to be sure and ask. Thanks!