I can see what you're getting at. I don't know what the average demographics of knife owners are, if any, but I guess people of all kinds get into them and there are lots of different types of owners. Collectors, hobbyists, people who own them just for utility, etc.
I'm a 23 year old architecture student. Heavily into hobbies, architecture, playing music, wood working, firearms, survival/prep type stuff, etc. Libertarian-ish. I've always been into design, especially functional designs, craftsmanship, quality in materials/engineering/construction, etc. That's a big part of what draws me to knives (mostly higher end knives), is the design, utility, quality, attention to detail, etc. All of the things you can admire. So I might be considered a bit of a collector in that sense, but I also use most of my knives and carry them daily. I like having them as a tool for whatever I might need to use them for. That probably comes from the survival/prep/firearms/outdoorsy part of me.
I don't know if I'm very trendy or not, but that's the kind of knife owner I am. I've always been interested in knives and thought they were cool. A few years ago I realized, "wow, I'm old enough now that my mom can't take away every knife I get and stick them in a coffee can way up high on some shelf where I can't reach them", and I've been collecting them ever since.