Oooh, I hate that term, "Seniors". Let me just address this to the Flower Child Generation. Those of you our age who have a Fixie, what flavor is it? I'm pretty ignorant about these. Does your Fixie have a freewheel, or is it "pedal forward, move forward - pedal backward, move backward", (or whatever they call that direct-drive system).
Reason I ask is that I was talking to one of my LBS guys who worked at a shop near my house when I was a teenager. They sold Mondia bicycles, and I have one. An old "ten-speed"...back in the day when a ten speed only had ten speeds. Two rings on the front, five cogs on the rear cluster. He said instead of restoring it, that I should turn it into a Fixie. Does that even make sense for someone in their early 60's? To be riding something like that? And, if I do build it up into a Fixie, should it have a freewheel or a direct-drive? What size chainring and what size cog?