Year change
Can I change my child’s birth year in family sharing? The cursor moved and now the year is wrong
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Notice the under 13 years old restriction.
Apple ID - Update the birth date associated with
If necessary, contact Apple ID Support.
Apple Support by e-mail or chat Work through the screens to get a chat option.
Or fill out and submit this form. The form is for iTunes, but it will get passed to the ID Support section.