The point is that when you evaluate the success, and the degree of success, of "aspects of Japanese lifestyle" that promote longevity, you need an accurate asse

The point is that when you evaluate the success, and the degree of success, of "aspects of Japanese lifestyle" that promote longevity, you need an accurate assessment of how long-lived Japanese people are. We get a very different understanding of the value of, say, the Japanese diet if Japanese life expectancy at age 2 is 84 versus if it's substantially lower.