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Research on Aging
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When Does Aging Begin?

Leonard Hayflick

Center for Gerontological Studies, University of Florida

The lack of a precise definition for biological aging precludes a definitive answer to when the phenomenon begins. Since longevity is a determinant process, aging begins when longevity assurance genes cease to be expressed.

Research on Aging, Vol. 6, No. 1, 99-103 (1984)
DOI: 10.1177/0164027584006001005
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