first, I just turned 50.
as for the fate of our hobby, I'll bet if you take this poll again in ten ot even twenty years, you'll find the exact same results. the hobby isn't getting older, younger people are coming in and aging, and older people are falling away and not riding anymore. somewhere between 50 and 60 is where most people are slowing down in their working life and enjoying more hobbies.
in short, the names change, but the ages stay the same. it's a pretty good bell curve.
I entered in the 30-39 end of the curve, and God willing will exit with the 2 in the 100+ category.