Kudos to Alicia Silverstone of “The Crush” for wedging a rare, female-senior May-December romance into a really weird movie. “Last Survivors” (2022) starts out as a typical, post-apocalyptic action flick. Then, after a brief visit to the Twilight Zone and boudoir, it becomes a typical woman-in-danger flick, complete with incompetent cops and big misunderstandings. All because some crazy dad decided to take young Tom Brady into the woods and turn him into Alaska Tarzan. Silverstone is also crazy, and also dealing with some family drama by not dealing with some family drama, but not in a homicidal sort of way.