I need to update child age
I want to update child age, because I made a mistake at my daughter Apple id
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This article has the steps on how you can change the birthdate of your child:
Update the birth date associated with your Apple ID - Apple Support
If you encounter an error message that says you need to contact Apple Support, please do so. That way, they can check what can be done
Contact - Official Apple Support
Hope this helps! Best of luck!