[lon-jev-i-tee, lawn-]
a long individual life; great duration of individual life: Our family is known for its longevity.
the length or duration of life: research in human longevity.
length of service, tenure, etc.; seniority: promotions based on longevity.

1605–15; < Latin longaevitās. See longevous, -ity

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World English Dictionary
longevity (lɒnˈdʒɛvɪtɪ)
1.  long life
2.  relatively long duration of employment, service, etc
[C17: from Late Latin longaevitās, from Latin longaevus long-lived, from longuslong1 + aevum age]

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Word Origin & History

1615, from L.L. longævitas "great age, long life," from L. longævus "long-lived," from longus "long" (adj.) + ævum "lifetime, age."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

longevity lon·gev·i·ty (lŏn-jěv'ĭ-tē)
Duration of an individual life beyond the norm for the species.

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
Here the units of life are depletion, longevity, and unremitting loneliness.
But she was popular for her guts, zest for life and sheer longevity.
Note also that the longevity of components is not nearly as long as western
  design and produced alternatives.
In the quest for longer life, scientists are trying to find the genes of
  longevity and bottle their benefits for all.
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