Sociology / Soc 1123 · Atom · ~20 seconds
Primary and Secondary Aging
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Primary aging is biological change from molecular and cellular processes; secondary aging is change caused by controllable factors such as diet and exercise.
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Thinning skin and graying hair are primary; a decline driven mainly by inactivity is secondary and can be slowed.
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The two interact, and observed decline in a given person is rarely purely one or the other.