At this particular event, I was the youngest present. The PRRT&HS annual meetings tend to have similar demographics. The contrast is to that of the shows I go see, where I'm as often the oldest.
A friend of mine who's retired poses that as people who remember things die off, the museums we are building to their memories, enshrining them, will similarly die. He suggests lack of cultural relevant will dry up the pool of volunteers as well as donations. It may be true, but I observed something else as a larger and more immediate problem. There are in such organizations, and probably all of them, 2 large groups of people who take up most of the membership, but not all.
First are the ones who volunteer for too much (with too many organizations), overcommit themselves and can't deliver it all.
The other are the ones who volunteer for little or nothing. What I haven't figured out, especially for myself, is how to commit correctly so you don't end up disappointing people, instead of trying to be all things to all people.
Coming full-circle, recent discussions on creating an OpenAFS Foundation of course reveal these same groups. They also revealed a bit of dissent, some helpful, and some excessively acrimonious.
There is a non-zero temptation to find something else to do with my life. Think any steel mills are hiring?