nuccca
A logical way would be to rename the Dolphin Index.php page to something, then create your own index splash page with a date of birth verification.

This is what many sites use, and really, their is no guarenteed way to verify age.
 
 
Below is the legacy version of the Boonex site, maintained for Dolphin.Pro 7.x support.
The new Dolphin solution is powered by UNA Community Management System.
PET:0.14491200447083