I agree with you diego. You shouldn't have to put up with it--regardless of your age. (and what the hell does that have to do with it anyway? Do people below 50 not complain if they can't get to sleep until after 3 am?)
I would complain if I lived next to a "typical Dominican bar", too.
There are law that protect you from noise problems and you should actively protest. I assume your neighbors feel the same way; they should be visible in the protest, too, not just sit back and let you carry the ball.
I heard recently of some people who went to the police and signed a complaint about the loud noise in the night of a disco. That seemed to have the desired effect. Contact all the people recommended in this thread, and do it with others if you possibly can.
If it were me, I'd be upset enough and mad enough to want the help of an attorney if I didn't seem to be getting the desired results on my own.