Do you miss something on BrainKing.com and would you like to see it here? Post your request into this board! If there is a more specific board for the request, (i.e. game rule changes etc) then it should be posted and discussed on that specific board.
If you keep kids from PM'ing and other stuff, they'll just go to their profile and change their birth date to be able to...
If you keep adults from posting or reading on a teen board they'll just need to go to their profile and change their birth date so they can be able to...
There is no way to enforce stuff like these...
And what about mixing conversations from a teenager with conversations from 8 yeard old's? Isn't it kind of the same problem?