Pretty much comes down to this. Some fields allow 16 year olds if a parent/guardian can sign for/supervise you at the game. You cannot own or buy an airsoft gun until you're 18. Your parents can, but you have to be under their direct supervision as it belongs to them and they are responsible for your actions.
I joined this board when I was 16 as well. I waited till I'm 18. Read, read, read.