I don't even know how parents let their 10 year olds play this game. http://www.youtube.com/watch?v=aziUiydMtU0&feature=player_embedded The conversation was really hilarious.
I've actually played with a few mature(for there age) 10-13 year olds before in tf2, honestly, why does everyone think OMAHGAWDHISVOICESOUNDSSOYOUNG, everyone sounds like that when they are 10, talking in a mic doesnt help either.
Well, In my opinion, If I KNOW I have a cheap Mic and my voice is a little TOO annoying for my age, I wouldn't bother using the mic at all.