Why is my 14 yr old listed as adult with my name on our account family sharing
First log in to Apple ID and update his birthday, name etc. 

Second, log in to the organizer account and change the role for all accounts that are incorrect. If this is correct and still shows Adult, you can kick him from Family Sharing then invite him again as a non-adult. :) If you save their real birthdays, they will be picked up as minors/teenagers by their age (-18).

Check this post, for interest sake. :P


  Family Sharing and Apple ID for your child


At the bottom of Apple's support articles, there's a contact us link to get personalized support or you can start at http://apple.com/support