The grandparents of Okinawa, Japan, are among the longest-lived humans on Earth. Their grandchildren are dying younger than the rest of Japan. Within a single generation, one of the world’s most famous longevity populations has collapsed, in a peer-reviewed finding that has overturned decades of assumptions about the secret to a long life

The collapse is one of the most carefully documented demographic events in modern science, because Japan keeps detailed life-expectancy statistics for each of its 47 prefectures and has been doing so continuously since 1965. The records show a population traj…

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