How to make the age of attendees a mandatory question

1. Go to Settings > Bookings > Booking features. 

2. Set the Allow individual age selection option to Yes and click Update details at the bottom of the page. 

3. Then go to Settings > Activities. Locate and open up the specific activity that you wish to allow mandatory age selection for.

4. Once you have found the activity details, scroll down to the Group bookings green scross symbol. 

5. Set the Mandatory group member age selection option to Yes and click Update activity.