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 ?
Our same survey showed that trees in residential areas, where the soil is healthier and more plentiful, have an average life span over 40 years.
It must--the blue-tongued lizard boasts an average life span of up to 20 years.
The average life span will reach ninety years of age, and will add stress to socio-economic resources.
Since 1949, the average life span in China has risen from 35 years to the current 71," says Brown.
Most live into their 80s, compared to an average life span for most British males of only 75.
Since 1900, the average life span of people living in this country has lengthened by over 30 years, and 25 of those years are attributable to advances in public health.
With the average life span now hovering around 76, it's nice to think that we'll all be shagging away well into our golden years.
This says a lot about the attachment people have to their furniture since the average life span of a couch/sofa is seven years according to respondents.
According to Millstein, the average life span of most clothing lines is five years or less, but "if you hit, there's a ton of money to be made.
The elaborate terraces, which were constructed in 1931 and traditionally have an average life span of 20-25 years, have needed minimal repairs throughout the years.
The average life span of pool surfaces is 10 years.