I had this exact problem when I was 19. I got soooo bored of the bar and club girls I usually dated. So, I started going out with older women. They are MUCH more fun, and so damn easy to pick up. If you are funny, intelligent, and good looking, its like shooting a fish in a barrel. Uni graduates are usually fun.
You could always don a suit and go cruising the streets of the business district .
For me, its around 24-30, when I was 19, it was 22. Obviously, I wouldnt recommend picking up 40+ yr olds. They tend to be rather clingy to their toy boys .