Why hasn’t Hollywood realized that old people are a gold mine of story material? Though Nathan Hansen’s documentary opens with a quote from Simone de Beauvoir about how a society should be judged by the way it treats the elderly, his film is more about what old people can offer than what they need. In a style reminiscent of Errol Morris, he interviews seniors from disparate backgrounds, each with exemplary tales to tell. They include a Japanese-American woman whose dream of becoming a teacher ended when she and her family were put in an internment camp during World War II, and a Native American Vietnam vet with post-traumatic stress disorder who exorcised his demons through carpentry. Asked why he works with old wood, he sums up the film’s theme, explaining that society disposes of used things too quickly, and is the poorer for it. (April 28, 12:45 p.m., Somerville)