Sky Bergman is a filmmaker and teacher based in San Luis Obispo, California, a university town known for being the home of Cal Poly (California Polytechnic State University). In 2017 Bergman brought her documentary “Lives Well Lived,” which shared the wisdom of a group of gloriously happy senior citizens, to the Santa Barbara International Film Festival. It’s a wonderful film—which I hasten to even describe as “little”—that sheds light