Don't adults have money to see films, or do they give it all to their kids? They're the forgotten summer demographic: people old enough to run for Congress. They got meager movie servings over the past few months. The Johnny Depp Public Enemies waved vaguely in their direction, with '30s couture and mature amour, but at heart it was another crime drama, however pensive and broody. The only film aimed squarely at upmarket boomers was Julie & Julia, about a flutey-voiced chef from an old PBS series. The movie is doing nicely, thanks in large measure to high senior attendance. On J&J's opening day, fully half the audience was over 50. Theater owners should have sold boeuf bourguignon at the concession stand — and maybe had a pledge drive to boot.