Yeah, while this Swan may be a lot of boat for the money, it would probably be a huge mistake. This is an ocean-racer for an energetic crew ... and it is not fit out for a Caribbean-cruising couple. It is especially not suited for the Bahamas. The teak decks will be your worst nightmare. The cockpit may be suited for ocean racing but it is an uncomfortable mess for cruising. How would you get comfortable in that segmented compartment? It has heat, but no air conditioning it seems. That's just great for the Caribbean, isn't it?

Access for swimming is just great with that extremely swept reverse transom ... just wet down the transom and slide right in! Nevermind that it's almost impossible to get out of the water, or into or out of a dinghy!

There appears to be 6 sets of winches along the sides ...two sets accessible from that weird cockpit configuration with 2 compartments. What would you do with all those winches, except service probably 4 sets that you don't use? It seemed like the battery capacity was pretty light for a cruiser to me, plus it is set up for 24v (which may or may not be something for you to change).
This Swan appears to be a highly specialized boat for very few sailors to enjoy, which is probably why it is priced low ... few buyers are interested plus it is reaching 40 years old. I'd bet it is just ripe with issues that the owner doesn't want to address with all the time and money that would be required. It's definitely a dated boat, and not in a good way.
Also, don't underestimate the muscle power that is required to handle sails on this size boat. My wife has a very hard time handling the sails on our 33' boat. She doesn't have the strength to trim our genoa for close-haul sailing and I have to admit that it isn't easy. On a boat over 40', I suspect that powered winches are an absolute necessity for an aging couple. This boat would be your worst nightmare for cruising the east coast and Bahamas, I think.