I ride regularly with a group of older/retired men and women. They ride hard, regardless of age. Most of them are on high end carbon, a few others on custom steel or titanium- Bedford, Spectrum, Moots, Guru, etc. So these are knowledgeable, experienced people who can afford to (and do) ride pretty much anything they want.

I'm the sole guy on vintage. The group is friendly & politely interested in my rides, but none of them are jumping onto the vintage bandwagon. Right age group, right financial situation, just no interest. So, there's that as a data point.

While I think there is some small percentage of young people with an interest or perhaps a curiosity in vintage bikes, as evidenced by the crowd at Eroica a month ago, as has been mentioned above most of the C&V crowd is, um...older. And unless there's a renewal of interest by younger generations, the whole price/supply ratio will only get less advantageous to sellers and more so for buyers. Which is why those $3500 vintage De Rosa/Masi/Colnago bikes are going begging.

Bottom line, I think, is buy now & enjoy now, but don't consider your two wheeled friends as an investment.