"Youth Without Youth," Francis Ford Coppola’s return to directing after a ten-year break in 2007, presents a perplexing mix of qualities – captivating, diverting, lovely, baffling, artificial, and at times, tedious. The story centers on a man of seventy, portrayed by Tim Roth, living in Romania as World War II begins. He’s struck by lightning, regaining his youth to appear around forty years old. Along with this t…