Don't think age has much to do with it, except combined with the economy and most having kids... I'm 30, and most of my mates would love an old Vette, but they have kids and/or job insecurity. My wife and I have reasonably safe jobs (as far as any are nowadays) and no kids, so I have cars and she has horses. Of course, if we still had to play in the ridiculously expensive Sydney housing market then we wouldn't be able to afford either... And even in our situation I couldn't afford the top end of the market. My '79 was a bargain priced local car, mechanically needing some work, but zero rust, decent interior etc, here and registered for 5 years. It had still sat on the market a while, and I haven't seen anything comparable in value come up for sale since.
Also, on the rhd thing, as someone who works on my own cars, I'm not interested in a rhd, would prefer lhd. Main reason being parts availability and not having any issues with a hodgepodge of components. Even for my '79 f250, which was an Aussie built one, it's all the rhd specific parts that are hard to find/buy, and that's a factory built vehicle that was made in reasonably large numbers!
Anyway, just my 2c.