Apple ID, change of age

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. 

I`ve got the same problem and I am not receivng the email as the family organiser, so I cannot approve it!