I hear from a lot of guys lately that the muscle cars of the '50's - '60's - 70's are the most popular right now. I'm 33 and trying to sell my vehicles from that era to buy more '40's era cars. After attending another pre-'49 only show two weeks ago, with 3800 entries of street rod and restored cars, I can see it is still popular with some people. Lots of younger folks were there too.
There are several guys in our group that encourage the young kids to sit in there cars and have their picture taken. I try to avoid that unless it is someone I know, but hey if I've got a old car with an old interior I'm not real worried about, who cares. 10 years from now that kid may pick an old car over a souped up Honda to drive. Would be worth it to me.
I gave up on the all day shows, other than the larger shows several years ago. Even at the larger shows I get there early and am usually gone by 2-3 and headed back to the hotel, usually don't go on Sunday and avoid the awards ceremonies. I enjoy the local cruise in's, where the wife and I can eat supper, hang out with the car people, and still get to drive our car. Having a whole lot more fun and avoiding the trophy crowd.