XBOX LIVE HELP a?

ok ive got lord of the rings battle for middle earth 2 on my xbox 360 and it says i need to be 13 or over to play live and yes my age that i put in to sign up for xbox live is lower than ten so how do i change it ive tryed just about everythingXBOX LIVE HELP a?u have to use the parents email log into that and set it up so that u can play that game u may also have to change ur current email to another that says ur of ageXBOX LIVE HELP a?you have to make a new account or find the password your mom put in for the child account hope this helps dude.