Some interesting statistics on Japan’s longevity in this Guardian article:
A baby girl born in Japan today can expect to live to 86 and a boy to nearly 80. But it has not always been so.
According to a paper in a Lancet series on healthcare in Japan, this is a rise of 30 years from the expected lifespan in 1947. While Japanese diet has contributed, it is far from the only factor.
The remarkable improvement in Japanese health began with the rapid economic growth of the late 1950s and 1960s. The government invested heavily in public health, introducing universal health insurance in 1961, free treatment for tuberculosis and cutting childhood deaths through vaccination and treatment of intestinal and respiratory infections.
via Japan’s life expectancy ‘down to equality and public health measures’ | World news | The Guardian.
But all is not rosy in the Land of Wa:
At the moment, 23% of the population is over 65 but by 2050, that will rise to 40% in a population shrinking from 127 million to 95 million. Other problems include drinking and smoking among overworking business people and a high suicide rate partly attributable to rising unemployment. Unless these issues are tackled, the paper suggests, Japan could lose its position at the top of the longevity table.