The Japanese have a term for their suddenly trendy vintage cars. They are called nostalgic cars, said Benjamin Hsu, a co-founder of Japanese Nostalgic Car, a Web site and magazine based in Diamond Bar, Calif. “You know how the Japanese like to appropriate English terms but use them in a slightly different way,” Mr. Hsu said.

Yet the name is fitting. The demographic that’s seemingly responsible for the popularity of Japanese nostalgic cars is 30-something men who grew up with the cars. Mr. Imai remembers his uncles working on and racing Datsun 510s and 240Zs when he was a boy.

“When you have cars that were everyday cars, there’s an emotional connection,” said Bryan Thompson, a designer for Nissan, both in the Japan and the United States, from 2001 to 2009. “They’re a part of your life in the way a pet is a part of your life, or a family member.”

Mr. Thompson, who is now a contract designer for Volvo, cited his parents’ 1983 Toyota Tercel wagon as the inspiration behind his career choice.

For Mr. Hsu, interest in the era’s cars was stimulated during a layover at the Narita airport near Tokyo on a trip to Taiwan. “I stepped out for one second and saw the coolest cars I had ever seen,” he said. “They were cars that I never knew existed. That kind of blew my mind.”

Mr. Hsu founded the Japanese Nostalgic Car Web site with his brother, Dan, in 2006. They began publishing the magazine, a quarterly, two years later.