Demographers have been tracking a curious phenomenon for decades: the so-called Blue Zones, a handful of pockets around the world whose (0) LONGEVITY (LONG) defies statistical expectation. The 1INHABIT of these communities routinely live past one hundred in relatively good health, a pattern that cannot plausibly be attributed to 2GENE factors alone. Careful comparative studies point instead to a cluster of 3ENVIRONMENT and behavioural variables: sustained physical activity embedded in daily life, plant-centred diets that essentially rule out 4NUTRITION, and a cultural embrace of purpose that persists into old age. Conspicuously absent is the steep 5DECLINE curve of loneliness seen in many Western societies after retirement. What emerges is a model in which 6COGNITION engagement, social density and moderate physical stress reinforce one another, sustaining 7VITAL well into the tenth decade. Perhaps the most striking finding is how 8EXPECT modest the contribution of modern medicine has proved to be.