Moreover: we are to consider, that from the presumed great longevity of whales, their probably attaining the age of a century and more, therefore at any one period of time, several distinct adult generations must be contemporary.
http://www.thefreedictionary.com/longevity
More recent longevity claims are subcategorized by many editions of Guinness World Records into four groups: In late life, very old people often tend to advance their ages at the rate of about 17 years per decade ....
https://en.wikipedia.org/wiki/Longevity
Reflections on longevity have usually gone beyond acknowledging the brevity of human life and have included thinking about methods to extend life. Longevity has been a topic not only for the scientific community but also for writers of travel, science fiction, and utopian novels.
https://en.wikipedia.org/wiki/Longevity
Hawks will not pick out hawks' eyes. (English proverb). Who knows to praise sure knows to insult. (Albanian proverb). They kill the peacock for the beauty of its feathers..
http://www.audioenglish.org/dictionary/longevity.htm
The word  longevity  is sometimes used as a synonym for  life expectancy  in demography-however, the term longevity is sometimes meant to refer only to especially long lived members of a population, whereas life expectancy is always defined statistically as the average number of years remaining at a given age.
https://en.wikipedia.org/wiki/Longevity
However, this is not the most popular or accepted definition.[1] For the general public as well as writers, the word generally connotes long life, especially when it concerns someone or something lasting longer than expected (an ancient tree, for example).
https://answers.yahoo.com/question/index?qid=20091105084422AA3Ds4x
Longevity is best thought of as a term for general audiences meaning 'typical length of life' and specific statistical definitions should be clarified when necessary.
https://en.wikipedia.org/wiki/Longevity
lon·gev·i·ty. n. pl. lon·gev·i·ties. 1. a. Long life; great duration of life: His longevity vexed his heirs. b. Length or duration of life or viability: comparing the longevity of men and women; factors that affect the longevity of seeds.
http://www.thefreedictionary.com/longevity
Various factors contribute to an individual's longevity. Significant factors in life expectancy include gender, genetics, access to health care, hygiene, diet and nutrition, exercise, lifestyle, and crime rates.
https://en.wikipedia.org/wiki/Longevity
1. long life; great duration of individual life: a family known for longevity. 2. length of life: research in longevity. 3. length of service, tenure, etc.; seniority: promotions based on longevity. longaevitās.
http://www.thefreedictionary.com/longevity
what longevity mean
Longevity means typical length of life. Typical length of life is called longevity.