The longest-living populations in the world share a set of lifestyle characteristics that are more consistent across their cultural differences than the specific practices that distinguish them — incidental daily movement embedded in how life is structured, plant-heavy diets with legumes as a central protein source, practiced caloric moderation, sustained social integration across the lifespan, and a culturally supported sense of purpose that provides meaning without requiring individual construction. The evidence from Blue Zone research is more robust than most longevity intervention studies precisely because it reflects what populations have been doing across generations rather than what individuals have been prescribed for months. The findings are actionable — but they point toward structural life design rather than supplemental interventions.