SteveDR,
A great start is hitting local bars in the Colonial Zone. Can you dance Merengue or Bachata? Dancing is a great icebreaker and I have good success usually being the only gringo in a bar in Santo Domingo. Usually the Dominican women that are single are sitting together, going out as friends, approach the table and hold your hand out and ask to dance. I don't know about being aggressive but confidence works. A must is being able to speak pretty good Spanish, something I am still working on but I can hold a decent enough conversation.
I also have met women shopping at La Sirena Supermercado and other stores, Acropolis, etc. Being pleasant and confident is most important. No problem with being older than the woman but looks/money do come into play. If you are 60, bald, and extremely overweight, don't expect normal girls to throw themselves at you. Now the cueros don't care about anything except the money. You implied you are 45 so as long as you speak basic Spanish at minimum, are very polite, not looking like Quasimodo, you should do well. If you can't dance, ask a dominicana at a non touristy bar and she would more than happy to show you and a great icebreaker. Oh, if you are rich and handsome and speak Spanish, you will have a very good time. I am 26, not rich, basic/intermediate spanish, ok looking and I have great success when hooking up with normal girls, now girls from Boca Chica are just a pay for play situation no matter what you look like.
In response to other comments: I can agree with sancochojoe that people like the exotic. Darker men do very well with women in the US and especially in Europe. Believe it or not, white men do very well with black women in the US, if they try, because I have been with more black women than white women. Race has nothing to do with intelligence, but race can offer greater educational opportunites and financial benefits due to racism/prejudice in a society. In lesser developed countries it is a given that if you have the dollars you can have the pie regardless of race and people are more ready to marry for financial stabilitly than the highly dramaticized "Love". Well I guess we have all hijacked the thread enough but there is no magic formula to meet a woman from any country, it mainly depends on the person.
dale7