remove children account from iPhone

Hello JulienCornut,

Thank you for using Apple Support Communities. We understand that you'd like to create a new Apple ID for your son to make it an adult account. We're here to help.

If the date of birth is incorrect for your child's account, you can simply correct the date rather than create a new adult Apple ID. Check out the steps in the resource below:

Update the birth date associated with your Apple ID

If we have misunderstood your issue, please tell us more about what you're trying to do. Be sure to include any steps that you have tried so far.

Have a great day!

JulienCornut,

Thank you for following up. We apologize for the mistake with the link. Try the steps here:

Update the birth date associated with your Apple ID

If you're still unable to update the date of birth, contact Apple Support for further assistance.

Contact Apple Support

Take care!