cells from humans,
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, too. But no antiaging treatment makes mice or any other animal live forever. Researchers have yet to increase a mouse’s life span (which rarely goes above two years) to five years,
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, although one mouse fell just short of that mark.
Much research suggests that things that extend life span, such as rapamycin,
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, might not stretch health spans. Mutations that make millimeter-long transparent worms known as Caenorhabditis elegans live longer also extend the proportion of their lives the worms spend being frail,
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, Heidi Tissenbaum of the University of Massachusetts Medical School in Worcester and colleagues reported last year in the Proceedings of the National Academy of Sciences.
But living healthy doesn’t guarantee longevity either, a new study of sea urchins suggests. Red sea urchins (Mesocentrotus franciscanus) live well past 100 years old in the wild, while purple sea urchins (Strongylocentrotus purpuratus) make it to 50,
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. But variegated (also called “green”) sea urchins (Lytechinus variegatus) normally die after four years.
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, although none seem to age. Red sea urchins (<em>Mesocentrotus franciscanus</em>,
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, top) live over 100 years. Variegated sea urchins (<em>Lytechinus variegatus</em>,
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, middle) live only about four years. Purple sea urchins

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