Well I am 29, and are involved in some comitty work here in Denmark, but the cost of storage and having vehicle might be the reason why, not that many, young people do not have vehicles.
The only reason why I can have the vehicles I do, is that my father has farm where I can store them.
But I would not give up hope with young people, I have 17 year old friend who has just bought a GMC 352, but we also have to show and take care people are shown these vehicles and maybe help out with a restoration so it can spark an interst.