Dictionary of Human Evolution and Biology

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Age

1. chronological status of an individual measured in arbitrary local units; such units may be internal (generational, as with the growth stages of childhood, adolescence, adulthood...), or external and cyclical, such as lunar, solar, or, even rarer, dependent upon the cyclical blossoming of certain local plants, and so forth.

2. a recognized historical interval such as the Elizabethan age or geological period such as the Age of Mammals.

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