How Do I Change My Age So I can Play Fifa Online? ?

On Xbox Live email address it says i am 12 and when i try play fifa 09 online its says i am not old enough to play i have changed my windows live id to a address that says i am 18 but it still says i am not old enough.How Do I Change My Age So I can Play Fifa Online? ?make a new profile and account saying your 18How Do I Change My Age So I can Play Fifa Online? ?Wait six years then try again.