life expectancy

noun
the probable number of years remaining in the life of an individual or class of persons determined statistically, affected by such factors as heredity, physical condition, nutrition, and occupation.
Also called expectancy of life.


Origin:
1930–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
life expectancy
 
n
Also called: expectation of life the statistically determined average number of years of life remaining after a specified age for a given group of individuals

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

life expectancy n.
The number of years that one is expected to live as determined by statistics.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Average life expectancy, today at an all-time high, could in our generation
  increase ten more years.
Predicting life expectancy accurately is the biggest obstacle to pricing
  longevity risk.
Already, people predict that this new generation's life expectancy may be lower
  than the previous.
Not only that, but life expectancy reached an all-time high, of about
  seventy-seven years.
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