- published: 17 Feb 2015
- views: 55525
Life expectancy is the expected (in the statistical sense) number of years of life remaining at a given age. It is denoted by ex, which means the average number of subsequent years of life for someone now aged x, according to a particular mortality experience. (In technical literature, this symbol means the average number of complete years of life remaining, excluding fractions of a year. The corresponding statistic including fractions of a year, the normal meaning of life expectancy, has a symbol with a small circle over the e.) In modern times, life expectancy has substantially changed on a yearly basis and cannot be used accurately for long-term predictions.[citation needed]
The term that is known as life expectancy is most often used in the context of human populations, but is also used in plant or animal ecology; it is calculated by the analysis of life tables (also known as actuarial tables). The term life expectancy may also be used in the context of manufactured objects although the related term shelf life is used for consumer products and the terms "mean time to breakdown" (MTTB) and "mean time before failures" (MTBF) are used in engineering literature.
How Long Are You Going to Live?
5 Countries With The Highest Life Expectancies
My Life Expectancy
10 Countries With The Lowest Life Expectancy
Life Expectancy Calculator - This is Britain with Andrew Marr - Preview - BBC Two
Work until you're 100 - Japan's Incredible Life Expectancy
25 Most Effective Ways To Decrease Your Life Expectancy And Die Young
How Much Will Our Life Expectancy Increase?
10 Countries With The Highest Life Expectancy
A simple life expectancy test - How To Stay Young: Episode 1 Preview - BBC One