I am totally with you, Mister Longface.
And reading the butthurt comments by kids in this thread (where they should not be allowed, as well) is proof that you are right.
I would suggest a short Gandalf-video clip running automatically on detection of an underaged player:
"You shall NOT pass..!"
and - poof - the screen turns black.
English
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Their vile comments are proof that I am correct.