Change an xBox child account to an adult account

I can't remember 100% but I am sure whoever set up the child account can change it. Like if you made an adult account on the xbox before making the child account that adult account can change wether the child account is a child account or and adult one.
I will just test this out myself now and post how it went

You can change a child account to an adult account, but you can't change an adult account to a child account. In order to manage them, you would have to create new child accounts for them.

Hey Xwarrior,

Did this account graduate naturally from a child account to an adult account or was there a birthday change attempt? You can change the birthdate to the Microsoft account but it will not change the birthdate that was entered originally to the Xbox profile.

In other words, a child account will remain a child account until it graduates naturally to an adult account. No way around it.

Hello PhilipBasgal,

Thank you for posting on the Xbox forums. We understand that you are interested in changing a child account to an adult account. Once an account has been established as a child account, it cannot be changed to an adult account until the child turns
18. The best way to manage the child account is to
add it to a family. This requires an adult account to add the child account to the family. Once the child account has been added to the adult account's family, the child account will be able to access online features. Be sure to let us know the results!

Its not possible to change from an organizer (adult account) to a member (child account). Whether the account is an adult account or child account is dependent on the date of birth entered when the account was first created. The date of birth on the Xbox
account cannot be changed either.