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life span |
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life span, the length of life of an individual or the average length of life in a population or species. life span average duration of life in animals of the species in average circumstances where special treatment to maintain life is not provided. Called also characteristic life span—commonest age of senile death. Laboratory animals and small pets—gerbil 3-4 yrs; guinea pig 1-8 yrs; hamster 15 mths-2 yrs; mice 2-3 yrs; rabbit 5-6 yrs; rats 3-4 yrs. Domestic pets—cat 18-20 yrs; dog small and medium size 15 yrs; large breeds 10 yrs. Farm animals—cattle 9-11 yrs; sheep 5-6 yrs; goat 8-10 yrs; pig 8-10 yrs; domestic poultry 5-6 yrs; geese—no data but apparently much longer than other domestic birds; horse 25-30 yrs. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Blood levels peak in early adulthood, around age 20, and then decline greatly during the human lifespan, falling by about 80% in the elderly. In discussing the risks inherent in extending human lifespan (September/October 2004), Michael L. Culture and behavior, this example seems to suggest, are much more important to determining human lifespan than genetic endowment. |
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