How can i change the age on my childs account? She is marked as an adult but is only 10 yrs old

Hello lura256,

To change the age on your child's account follow the steps from the article Update the birth date associated with your Apple ID:

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.