I sell a lot of bike stuff locally for a hobbyist (over 100 bike related items/year). I've moved a couple prestige brand C&V frames in the last year.

1. A Pinarello Asolo frameset last year sold for 325 to two brothers (they must've saved up for it). The older of the two was 17 or so, the younger was the bike mechanic guy, and he seemed like he was 13. They were really young. I asked why they were buying the bike (cause IMO, it wasn't a good deal at all), and the older guy said he just wanted a vintage steel Pinarello that he was going to ride every day.
2. Two weeks ago, I sold a 49 cm celeste Bianchi CDI original build for 600 to some Asian chick. She seemed 25 tops, probably a lot younger. She apparently didn't have a bike at the time and this was going to be her main ride.
3. Last summer, I sold a 54 cm celeste Bianchi CDI frameset to a UofT master's student who does bike repair for 200. He has turned it into a fixie for his girlfriend. She apparently loves it.
4. Just last week, I sold a rear wheel to some young guy. He was like 20 maybe. His bike was a steel Bertrand he bought from Cam's (above).

Can't remember too many other steel bike sales of "high end" steel, but come to think of it, I think every single one I have ever sold has been bought by someone younger than me (I'm in my 30's). And if you look at the prices I quoted above, they aren't getting them "at a great deal". So there are young people who are paying for these things.

Important point to mention. How much disposal income are young people supposed to have? I certainly didn't have 500 laying around just to buy a prestige bike before getting my first real income. The only person I know who bought a modern Bianchi pista frame brand new from the store, was some teenager guy who's dad spent $1000 to buy him one. Lots of young folks who come by to buy bike stuff, almost inevitably get wowed by my steel bike collection. These are people who are impressed with these bikes but who don't have the money to buy one.

Another important point. These 1980s frames can take on all modern componentry. So when you go on a club ride, and all those other riders are riding their GianTrekCervelized carbaluminum bike, while you're on a neat 1988 Superleggera decked out with 11-speed Ultegra, you'll have the coolest bike in the crowd. And yeah, people want their bikes to stand out, and getting a prestige steel bike is one way to do it.