Bama County, tucked into a mountainous corner of southern China, has one of the highest concentrations of centenarians on earth, and this film goes looking for why. Cameras follow residents well into their second century as they still farm, cook, and walk the terraced hillsides daily, while local doctors and visiting researchers weigh in on the physical factors that keep turning up: mineral-rich water, a diet heavy in vegetables and low in meat, constant low-intensity exercise built into daily chores, and clean mountain air. Interviews with elderly villagers and their families add the social side of the story, tight multigenerational households, low stress, a slower pace of life, that scientists suspect matters as much as biology. The film does not settle on a single cause, treating Bama's longevity as a puzzle with several interlocking answers rather than one miracle ingredient. What emerges is a portrait of a place where old age looks less like decline and more like an ordinary continuation of daily work.