XBOX LIVE EMAIL CHANGE HELP!!!!!!!!!!!!!?

ok i want to change my age on xbox live (my parents say its ok) but i says i need parental pemission so i type in the right email and password for my parents but it says it needs to be windows live but it accepted it for an email when setting up and it wasent windows live so how do i change the email address or age for xbox live?XBOX LIVE EMAIL CHANGE HELP!!!!!!!!!!!!!?Make a fake live email then try.