How do I change my child’s date of birth?
I created my child’s profile for family sharing, and the system wouldn’t let me select his correct age, it kept defaulting to an incorrect date. How do I go back to change it?
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Note the under 13 years old restriction in the article below.
Apple ID - Update the birth date associated with.
If necessary, contact Apple ID Support for assistance. See the Apple Support articles below for contact information.
Apple ID - Official Apple Support.
Contact Apple for help with Apple ID account security - Apple Support. (Link doesn’t always load)
Get Support Work through the screens to get a chat option. You may have to pick a slightly different problem.
Apple Support schedule phone call
https://twitter.com/AppleSupport. People have posted it may take an hour or more to get a response.