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Life expectancy is a term employed to statistically describe the average length of time a person within a given human population, such as a particular country or time period, lives from birth until death. Like other tools for determining the nature of demography, the measuring of life expectancy rates is sensitive to various factors. As a consequence, it can be calculated in different ways. For example, life expectancy may be measured without utilizing the infant mortality rate—this form of calculating life expectancy is commonly employed within nations that suffer from high child mortality levels.

Average life spans are longer today than in the past, thanks to modern technology and scientific understanding of disease. Increased wealth and improvements in standards of living have also led to better ...

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