life expectancy

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life expectancy

[′līf ik′spek·tən·sē]
(biology)
The expected number of years that an organism will live based on statistical probability.
(engineering)
The predicted useful service life of an item of equipment.

life expectancy

the number of years the average member of a social group can expect to live. This is largely determined by environmental factors, though improvements in these do not lead to an infinitely extendable life expectancy, since the maximum period of existence of a member of the human species remains at about 110 years and biological factors impose limits less than this for most humans. The average life expectancy at birth in the UK in the late 20th-century was for men 71, and for women 76, and this has changed little in the last half century However, there is variation according to social class and region. Currently these demographic differences are widening, with life expectancy in the north of England and Scotland being significantly less than that in the south. See also BLACK REPORT, DEATH RATE AND MORTALITY RATE.
References in periodicals archive ?
The study published online in eLife -- a new peer-reviewed, open access journal -- defined average life span as the point at which half the members of a given test group remained alive.
Although the average life span of someone diagnosed with ALS is just 3 years, Wade is still here fighting and inspiring after more than 13 years.
Billions of dollars have been spent on community programmes, housing and education, yet Aborigines remain the poorest, unhealthiest and most disadvantaged minority, with an average life span 17 years shorter than other Australians.
Those pension plans were developed when the average life span after retirement was counted in single digits.
The average life span of a healthy greyhound is around 14 years.
5 years even though the average life span of a properly maintained system is less than half that.
Researchers from Brigham Young University and the Harvard School of Public Health found that between 1978 and 2001, Americans' average life span increased almost three years to 77.
In 1966, when Respect-for-the-Aged Day became a national holiday, the average life span of Japanese males was 68.
For example, an HIV-positive patient starting CART at age 20 could be expected to live to 63--about 20 years shorter than the average life span of non-infected adults.
He said there is general agreement that the economy began its decline in July or August -- 10 months ago, or the average life span of a recession.
In terms of how long the system will last, at 50[degrees]C thermoplastic systems will have a maximum operating pressure capability in the region of 4 bar and an average life span of 50 years.
For some reason or perhaps not understanding the difference between life expectancy and average life span, the assumption has developed that people in the past had short lives.