One of the mysteries of the English language finally explained.
The age at which a person is considered to be mature or adult; especially the age at which a person attains his or her legal majority, or becomes legally competent for a specified function; also "†perfect years". In later use chiefly Scottish. Now historical.
Late Middle English; earliest use found in The Wycliffite Bible (early version). After classical Latin perfecta aetās; compare Middle French, French parfait of mature age, Middle French aage parfait.
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