How to change my date of birth under 13?
How do I change my date of birth if I am under 13?
iPhone 12 mini, iOS 16
You can't. If you really are under 13, control of your account belongs to whatever adult set up the account. If you're actually over 13 and the birthdate is a mistake, you're going to need to contact Apple Customer Support for assistance. Use the "Get Support" link at the top right of every page of these forums..