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Why has Japan become the longest-lived country in the world? The longevity is often attributed to Japan's economic growth, but Japan experienced an extended life expectancy prior to achieving such economic growth. During and after the Second World War when the General Headquarters of the Supreme Commander for the Allied Powers was occupying Japan, the welfare administration system was drastically reformed, resulting in dramatic improvements in the hygiene status, which led to an increase in the average life expectancy in Japan. Here, this background is reviewed, along with an explanation of how Japan has become the world's longest-lived country. [ABSTRACT FROM AUTHOR]