I am in my 60s, and I have hobbies: reading, knitting, writing, doing jigsaw puzzles, gardening, and scrapbooking (photo albums). Some of them are seasonal; gardening takes up too much time in the summer to indulge in jigsaw puzzles or scrapbooking. I think of a hobby as something that should be enjoyable, so I'm not sure gardening counts for me. It's a lot of work, at least on the scale I've been doing it.
My husband used to do reloading for a hobby, but he hasn't done that for years. And he used to do gardening, too, but his health doesn't permit it any more. He is retired, and all he does with his vast quantities of spare time is read stuff on his computer. I guess he is content with that, but it seems a bit unbalanced to me.
I know a few young people who read and knit and and do crafts, but I don't know if they use the word "hobby" to describe those activities.
RE: Late Night Musings: Whatever Happened to Having Hobbies?