"This account is not permitted to download content with this rating" :

Well obviously my X360 cannot tell I'm 18 so how do I fix this? I would like to try some demos that I cannot access. I went to my family settings and enabled the account to download all content with any rating. I assumed that would work but it didn't. What next? Thanks to anyone who can help.

Easy enough. Where do I do this?

You have to upgrade to an adult account which requires a credit card. Kcdragon8116

Nevermind I got it, thanks