Don't worry about the age thing so much right now. If you're really serious about getting into aviation as a career, with your flight experience, I'd move my butt as quickly as possible to get those multi-engine hours. No respectable regional is going to touch you without some multi-engine time. Your total time is a bit low compared to what these airlines are looking for. See for yourself at:
http://airlinepilotcentral.com/resou...070412222.html
So the reason why I say you need to hussle is two-fold. The airline hiring comes in waves. They're hiring big time right now if you have the hours. And who knows when this will end. Second, if that age 65 goes through, you can pretty much bet that those minimum hour requirements are going to go up (1000/100 at the minimum is my best guess). This means you'll be doing the CFI thing until the next wave, possibly.
I don't know of any place out of Long Island that you can get 100 hours multi-engine without shelling out a down payment on a house. Your best bet is to find that option outside of NY, unless money isn't a factor to you. But you can easily get those 100 hours (and make sure you're not buying into 50 hours of you flying and 50 hours of you watching someone fly program) and get them done in a month.
Good luck!