How do I change my children's birthdays on Apple Account?

Re: "How do I change my children's birthdays on Apple Account?"

Apple support provides an article (link below)to help with this:

See: Update the birthday associated with an Apple Account - Apple Support

Eg: says:

"Edit your birthday or a child’s birthday on the web

1. Sign in to account.apple.com with the account you want to edit.
2. Select Personal Information, then choose Birthday.
3. Update the birthday and click Save. If you’re changing a birthday from an adult to a child, find out more about converting to a Child Account.

Depending on how you created your Apple Account, you might be required to provide additional information or change your Apple Account primary user name from a mobile phone number to an email address.

Change the birthday for a Child Account

To change a birthday to any age below 13 (age varies by country or region), the account must be a member of a Family Sharing group, and the Family Sharing organiser must approve the change."

This link will take you straight to the section of a support article telling you how to do that --> Update the birthday associated with an Apple Account - Apple Support