How do I change my gamerpic to my custom gamerpic as a child?

The procedure for changing Gamerpics is here :
https://support.xbox.com/en-US/my-account/manage-gamertag-and-profile/change-gamerpic-on-xbox-one

The only restrictions mentioned are that a child's account cannot use a custom Gamerpic. There are no restrictions on how often you can change the Pic.

Hello Joel! I'm Kris and I'd be happy to help you with your question.

Unfortunately, you are unable to use a custom gamerpic for a child account. Only adult accounts can. Please see the link below.

https://support.xbox.com/help/account-profile/profile/change-gamerpic-on-xbox-one

Hello Nikolaj,

Thank you for posting here on the Xbox forums. We understand that you are having issues with uploading a custom gamerpic. If you haven't already, please review this support article: Change
your Xbox One gamerpic

There is a video showing you how to do it there. Please keep in mind that child accounts are not able to upload custom gamer pics. There is no way around this.

hey I'm trying to change my gamerpic with a custom image using xbox beta with my android phone. But it says I'm too young to change it. my account is a child account and it is impossible. I can't figure out how to change my age with my account or with an
adult account.

Hi Vinni 62,

Thanks for reaching out to us in the forums with this question. As your child's account was created a child account type, it will "age" naturally as your child does to reach "adult" status for the account. That being said, as our Ambassador has stated, you
must have an adult account in order to place a custom gamerpic onto the profile. For further information regarding custom gamerpics and child accounts I recommend our support articles entitled Changing
your Xbox One gamerpic and Definition of a Microsoft child account.

I hope that this information helps you out!