Sorry you need to be at least 18 to join the Xbox insider program

Sorry to hear it. If you entered the wrong birth date when you created the account then you cannot change it after the fact and the account would need to age normally.

If you are 18 or over and haven't yet promoted your account to adult then you can follow the instructions below to promote your account.

Hello. Below is the information you will need to promote your account. Sorry for your loss.



Xbox LIVE determines whether an account is a child account or an adult account based on the age of the account owner. Account owners who are younger than 18 are given child accounts in the United States.



Child accounts are tied to an adult's Windows Live ID. The adult account can control Family Settings and restrict some features of Xbox LIVE.



After you reach the age of adulthood (which varies by country and region), you can promote a child account to an adult account. This promotion removes the Family Settings and Xbox LIVE restrictions.





To promote a child account to an adult account



◦Sign in to Xbox LIVE by using the account that you want to change.



◦Go to Settings, and then select Account.



◦Select Promote Child Account.





Note This option is available only if the date of birth for the account indicates that you have reached the age of adulthood (18 in the United States). The legal adult age varies by country and region. The age of an account owner is calculated by using the
date of birth provided when the account was created. This date cannot be changed. If you entered an incorrect date of birth when you created the account, your only option is to create a new account using the correct date of birth.



◦Follow the on-screen instructions to promote the account.

If I remember you need to be over 18 to join the Insider program so there's nothing you can do to change that.

Hello mfundo jele,

Greetings!



Thank you for posting in Microsoft Community.



It appears that you are interested in testing new products or apps. Let us help you by providing the information to address your concern.

You can check the Xbox Insider Program which will bring our Xbox fans to get early access to new games and features, join playtests with developers, and provide feedback to help shape the future of Xbox. You can join the program by installing the Xbox Insider Hub app on your console or PC. However, to join the program, you must be at least 18 years old to join the Xbox Insider Program. If you are under 18, you can still participate in the program with a parent or guardian’s permission, but you will not be able to access some features or content that are restricted by age. For more information, see: [Xbox Insider Terms of Use (TOU)].

We thank you for bringing this concern here and glad to provide the needed information.



Sincerely,

Hello Wyatt,

Thanks for coming to the forums with your question. Unfortunately, you will not be able to sign up for the insider program. This program is for adults over the age of 18. However if your parents have an account they can try and join with their account. Just
have them download profile onto the Xbox and then go to the Xbox insider hub as you did.

Please have your parents read over the
Xbox insider program.

Thanks,

Brad

The issue with joining the Insider Preview program is that you need to be 18 years old. If your son's friends are below that age, they should not be in the program.

They are circumventing the safe guards of a child account, linked to a family account. They are also probably not aware of the issues that can arise from testing beta software on their consoles.