The world is still two Beatles shy of staging a Fab Four reunion. Nevertheless, Douglas County merchants who deal in memorabilia say customers of all ages still believe in yesterday. Whether it’s vinyl albums, vintage housewares, classic films or die-cast toys, there’s persistent interest in articles from decades past. And it’s not just baby boomers doing the buying. “With music, it really crosses over all generations,” said Marty Katz, owner of The Record Store in downtown Roseburg. “For a lot of us, it invokes memories of days of old — the first car, the first girl they danced with — …