Final answer:
Life expectancy is the average number of years a person is expected to live in a population, reflecting the health of that population.
Explanation:
Life expectancy is the average number of years that a person in a particular population is expected to live. It is calculated based on age-specific death rates present in the year of birth, reflecting the health and longevity of a population. For example, the life expectancy at birth in Japan in 2014 was 84.46 years.
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