Set us as preferredGreen Day’s new film, “Nimrods,” believes in the enduring power of a black leather battle jacket. “We see families coming to Green Day shows now — two, three generations. Green Day’s new feature film, written and directed with Lee Kirk, is an old-soul road trip movie. Music biz stuff is not the fun part, but then something will come up and you go, ‘OK, now that’s that’s why I do this.’ (Charlie Riedel / Associated Press)The modern world is off-stage in “Nimrods,” but Green Day has been more at the forefront recently.