I realize that the city where I live is not at all typical, but here goes:
If I plan to go out and play pinball some evening, I look for where the tournament is, and then go to the place that hosted the last one.
I don't really care for crowds, I'm in my late 40's, and I really like including my daughter, who just turned 13. None of these put me in the primary demographic of the tourney scene, which is way younger and more hip than I am. Maybe I'd feel different if there were a "senior circuit".
Around here, I find the idea that nobody under 50 plays pinball to be utterly laughable.
It may be true, as has been stated by others, that those players aren't the ones buying NIB games, but they sure seem to be playing the ones that other people are buying.