The one and nearly only thing that is set in stone on your Xbox 360 account is that of your birthday. I know this for a fact because I myself have run into this problem and have called Microsoft support numerous times only to be answered with, "your birth date cannot be changed." The only advice i can offer to you would be, if you are under 18 and want to download mature content, is to wait until you are 18 or simply start a new account. Just be aware that if you start a new account, all downloads will only be associated with that account.
No
I'm fairly sure you can change it by phoning Xbox live support and explaining the situation, just ask them you would like to change the accounts parental email to a different one
The US Xbox support hotline number is 1-800-4-MY-XBOX.
No.
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You go to the website and look at the bottom of the page for the number.
No
No. Xbox does not support modifications to games.
Call xbox support for help
The original Xbox with live isn't support anymore, so no.
Try Calling Xbox 360 Support on 0508 555 592 during opening times. Or contact them through their support system at www.xbox.com/support
No, there is no cross-platform support on the Xbox One or Xbox 360 (same with Playstation 3 and 4).
They have to support xbox live, this will be indicated on the back of the CD case.