Where does xbox live get you're age from?

Hey,

Got a new xbox and wanting to sign it up to live.

Wanting to be able to have full access to all games (18+) etc.

So I'm just wondering, does live get you're age from the email/microsoft account you sign up to live with? Or does it get the age from the birthrate you enter when signing up to live on the actual xbox? Or maybe both?

Hope you can help!

Pretty sure it's with the birthday you enter

100% right.

Birthday that you enter.

Do e-mail accounts even require your age? I dont remember entering my birth date when I created mine.