Oh, coming-of-age ensemble dramedies: let me count the ways I love them! Mike Mills’ semi-autobiographical 20th Century Women (A) is a blissful slice of life as characters on the cusp of change in freewheeling 1979 Santa Barbara craft an unconventional family. Central to the film is the relationship between never-been-better Annette Bening as an eccentric divorced chain-smoking single mother and her only son, played with perception by Lucas Jade Zumann. Buoyed by before-their-time left coast sensibilities, Bening’s character enlists three kindred iconoclasts as spiritual guardians of her son’s angsty adolescence. Elle Fanning is brittle brilliance, Greta Gerwig a luminous and tender spirit and a weathered Billy Crudup an unlikely boon companion. Mills intersperses flashbacks, flash-forwards, historical archives and literary snippets, coloring the story in lovely context. There are sequences of majestic intimacy between characters as they tumble, stumble, dance and glance through life’s foibles. The film is a tribute to the mother-son bond, anchored by resplendent female performances and a lens into the many portraits of womanhood. Bening centers the film with a marvelous mix of misanthropy and repartee; she is perfection in the role. Roger Neill’s spry music, plus songs showcasing the rise of an emerging West coast punk scene, accent this love letter to shifting mores and the enduring power of familial love.