How can I correct a child’s age on their Apple account?
I setup a child with an incorrect birthday, how do I fix it? When I set them up, I used the current date instead of the child’s birthday… and Apple thinks he is 4 when he is now 18 😵💫
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To change a birthdate, see the instructions in Update the birth date associated with your Apple ID - Apple Support
If the erroneous birthdate makes your son show as under 13, you will need to see the following from that support article:
If you need to change the birth date for a child, contact Apple Support.