Meet new people in your area, absolutely privately using open-source technologies. You're only a few clicks away to find new friends, dating and sexual partners. Looking for a girlfriend, boyfriend, quick hookup, one-night stand or just someone with the same interests? No problem!
I think it isnt problem. Why you want restrict access for younger people? They dont have rights to find new friends??
Or you wanna rather send them to claws of some proprietary garbage apps which sucks every possible information and sell to anyone for profit.
Beauty of opensource projects is, that anyone can forkit and make own instance with rules which want.