Change a child’s birthday
My child’s birthday is wrong. How do I change it?
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You need to contact Apple if the birthday for a child (usually under 13) is wrong.
See:
Update the birth date associated with your Apple ID - Apple Support
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Change a birth date for a child
To change a birth date to any age below 13,* you must be a member of a Family Sharing group, and your family organizer must approve the change. After you change a birth date to any age below 13, you can't edit it.* Learn more about Family Sharing.
- Update the birth date.
- Follow the onscreen steps to send an email request to your family organizer.
- Your family organizer will get an email with instructions to approve the request.
*Age varies by country or region. If you need to change the birth date for a child, contact Apple Support.
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Use that link or this:
Contact Apple for support and service - Apple Support
to contact Apple Support
Good luck!