How to Correct a Family Member's Age from Child to Adult?

Hello everyone,

I'm looking for some advice on the correct procedure to update a family member's age.

When I first created an Apple ID for my daughter under my Family Sharing plan, I made a mistake and entered her age as 12. Her actual age is 22. I created her account when I gave her a new phone during June 2020.

Now that she is an adult, the incorrect age on the account is causing some limitations. I have tried to find a way to edit the date of birth in the Apple ID or Family Sharing settings, but it seems to be locked because the account was created for a minor (under 13).

I have all the necessary official documents to prove her correct age.

What is the official process for correcting this type of error? Do I need to contact Apple Support directly, and if so, what is the most effective way to do that for this specific issue?

Thanks for any guidance you can offer!