Lorna, I agree with what you are saying about many of those who are retired. And many of the younger crowd are like you say too. But some of these “kids” are making insane amounts of money, and they just might spend some on large scale trains. I did say might.
But I always have to go back to the articles I read when I was a teenager, saying that model railroading as a hobby was dying off. The old times are dying off, and the teenagers are not getting into the hobby. Sound familiar? The folks that were teenagers then, those folks who “were not getting into the hobby”, are now 30 somethings and 40 somethings. And I see a lot of 30 and 40 somethings at train shows, with bags and boxes, scurrying to their cars with their treasures.
I am firmly in the camp of “plant the seed in the young folks while they are young”. Some will come back to the hobby, many will not come back to the hobby. But those who do, they are the future of the hobby, the unseen future, because first they have to establish a career, possibly a family, and then when they are ready, they will come back. I did, and many on another site I frequent, are new to the hobby, but my age or older.