As recently as 15 years ago, Barrett-Jackson and the other Scottsdale, Ariz., auctions were almost exclusively about the grand classics from the 1930s. No more. These cars have all but disappeared from the Arizona auctions and cars from the 1980s and 1990s have filled the void. It’s a sure sign that Gen-Xers are starting to become a force in the collector car hobby. Here’s a quick sample of some surprisingly popular newer cars at the Arizona auctions: