How to change an Apple ID from adult to child

Hello, elyse126.

Thank you for using Apple Support Communities.

From reading your post, you want to change the birthdate of an Apple ID. We'd be glad to help. Check out this article for information about changing the birthdate: Update the birth date associated with your Apple ID

"On your Apple ID account page

1. Sign in to your Apple ID account page.
2. In the Account section, click Edit.
3. Update your birth date and click Done. If you're changing a birth date for a child, learn what to do. 

On your iPhone, iPad, or iPod touch

1. Go to Settings > [your name].
2. Tap Name, Phone Numbers, Email. You might need to enter your Apple ID password.
3. Tap Change Birthday or Birthday. 
4. Update your birth date, then tap Done. If you're changing a birth date for a child, learn what to do. 

Change a birth date for a child

To change a birth date to any age below 13,* you must be a member of a Family Sharing group, and your family organizer must approve the change. After you change a birth date to any age below 13, you can't edit it.* Learn more about Family Sharing. 

1. Update the birth date.
2. Follow the onscreen steps to send an email request to your family organizer.
3. Your family organizer will get an email with instructions to approve the request. 

*Age varies by country or region. If you need to change the birth date for a child, contact Apple Support". 

Best regards.