My take is different here. It is not the age that is the factor.
What drives appeal here is almost all of these cars are affordable to young to all at a reasonable cost. Most in fact represent a good value in the collector market so they appeal to everyone age, sex and economic status.
You get into the higher end cars it is mostly older buyers with large amounts of cash that can afford them. Or web site designers that are ultra young leaving the middle out as they raise their families.
So I see affordability as the factor that ties this together making the by product age appeal.
You tend to like and buy what you can afford.
As for things like second gen Vipers. Well for near the same price you get less leaks and roll up windows. Options and styling can play a roll when the prices are close.
The CTSV is one I see all ages in and why? Cheap to buy, fast as hell and very easy to make even faster with all the parts for the engines. Years ago younger buyers would buy a Chevelle SS low miles and reasonable price. Today with the lack of RWD the CTS is prized today. We have several at work with monster power.
I'm gonna get on board with @Hacksaw here - I'm not even a Corvette guy, but I will stop and give extra attention to darned near ANY C2 that I get close to. C3 and later? Umm, well, less so...
You are correct on my age, so point-taken. However, I read the line in the article that says, "vehicles that are equally beloved by everyone", and did not take that to mean "cars that anyone buys", but cars that people really like - and the example of "at a car show" is given. If, however, you are specifically talking about ownership only, I'm in tune with your viewpoint @Longroofjunkie.
I wish it was "both young and old buy" but is just "both young and old submit a no commitment insurance quote".
Last 5 years of vehicles actually added to Hagerty policies --how much of this list holds up?
Less kids driving due to costs I would think, but part of it is just translation:
Families used to drive 5-6 seat full size vehicles that could tow a small trailer and take the gear on road trips (Impala, Galaxy, etc.). That is now an F150 crewcab with a tonneau cover or cap.
The families that bought a VW Beetle, Nova, Maverick as a second car and let the kid use it... have the older Corollas, Civics, Jettas and such.
The kids buying their own thing... have the lifted trucks, coal rolling Golfs, lowered Lancers with angle-in wheels and such which isn't that different than a Chevelle with tires sticking out the fenders and cherry bomb mufflers.
The rich kids showing off it is going to vary by regional demographics... some places that will be BMW instead of Vette and so on.
But you are also driving around in a nearly SIXTY year old car that goes for six figures plus too...it doesn't fit into this discussion. I'm talking about the past 20-30 or even 40 year old Corvettes.
I like the older Vettes but they are unobtainium for the vast majority of buyers.