In my humble opinion, the solution is the little town of CABARETE. It is not ALL younger folks, but definitely caters to that type of crowd. You’d love it.
Basically Cabarete is a small town on the North Coast that pretty much got built up for the tourist trade because of the idea conditions in the bay for both kiteboarding and windsurfing, which automatically tends to draw a younger crowd (us oldsters like to watch LOL).
In the evening, the bars and restaurants place tables and chairs right on the beach for dinner and after dinner recreation. There are also a couple of discos etc. Most of the bars run “specials” during the evening so it is interesting to watch the crowd move from one bar/disco to another as the “specials” kick in.
One of the best sites for specific Cabarete info is
One of the nice things about Cabarete is that everything is mainly on one strip so it is fairly easy to pour yourself back to your hotel once you are done your partying.
If you have any questions about Cabarete don’t hesitate to ask. I know it well, and if I don’t know the answer, I can probably get it for you.