I'm 16 and i would love to use the 18+ chat. My grandmother Wouldn't mind at all. Cause if there is swearing or anything like that, I would report it and i'm old enough to know better then to repeat it. I think you should allow kids under 18, if by parents permission, can use the 18+ chat, but get a email or a Message from the parents so u know its the parents, not the children.