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life span |
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life spanTime between birth and death. It ranges from a mayfly's day to certain trees' thousands of years. Its limit appears to depend on heredity, but such factors as (in humans) disease, natural disasters, war, diet, and habits such as smoking reduce it. Maximum life span is theoretical; more meaningful is average life span, which life-insurance companies and actuaries analyze and tabulate. Long-lived progenitors tend to beget long-lived descendants. A very-low-calorie diet appears to prolong life. Reduced infant mortality and improved sanitation and nutrition account for much of the increase since c. 1800—from about 35 to over 70 years in most industrialized countries. The oldest well-documented age reached by a human is 122 years. |
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| Numerous studies have found that calorie restriction can extend the life span of organisms such as yeast, worms, fruit flies, and mice. Longest-Known Life Span 200 Humans 122 Indian Elphant 78 Blue Whale 80 Sturgen (fish) 100 Giant Galapagos Tortoise 200 Note: Table made from bar graph. Tom Tatman, the company's president, said diversity was the key to the foundry's long life span. |
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life span
