I agree, these apps aren't ready to take off in many places yet. It's a matter of time for the requisite infrastructure to be in place (smartphone penetration, cheap ubiquitous data, and more societal comfort around collaborative consumption)
The old guys wanting to get it on with you is a pretty funny coincidence. I've had a lot of ultra-left hippie types that live what you can describe as a nomadic lifestyle. "Color" is definitely the best way to put it. Inspiring though!