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In captivity, two toed-sloths have lived more than 20 years; maximum life span is thought to be over 30.
The maximum life span is a theoretical number whose exact value cannot be determined from existing knowledge about an organism; it is often given as a rough estimate based on the longest-lived organism of its species known to date.
Untreated, these mice live an average of 50 days, and maximum life span is about 80 days.
The maximum life span is 2 to 2.5 years.
Commonly, the animals lived for at least 12 to 20 years, but the maximum life span is not known.
An age when senescence retards survival (i.e. near to the maximum life span) is reached by a higher proportion of individuals, and therefore remains under increasingly high selection pressure, in natural populations of longer lived mammal species (Fig. 2).
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However, he says, "it's unclear if the rate of aging itself is retarded," as proof of that requires that the maximum life span be extended.
Furthermore, Vaupel notes, for years scientists have suggested that both life expectancy and maximum life span were on the cusp of plateauing only to see them continue to inch up.
indicated that maximum life span was not, on average, a constant multiple of mean life span.
Maximum life span was calculated as mean age of the oldest 10% of mice per genotype.
Plotting this relation, which is independent from regression estimates, indicated that differences between predicted and observed maximum life span were not normally distributed around zero but became increasingly negative as maximum life span increased, which was tested using a Runs test.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com