- age
- c.1300, "long but indefinite period in human history," from O.Fr. aage, from V.L. *aetaticum (cf. Sp. edad, It. eta, Port. idade "age"), from L. aetatem (nom. aetas), "period of life," from aevum "lifetime, eternity, age," from PIE base *aiw- "vital force, life, long life, eternity" (see eon). Meaning "time something has lived, particular length or stage of life" is from early 14c. Used especially for "old age" since mid-14c. Expelled native eld. The verb meaning "to grow old" is from late 14c. Age-group attested from 1904, originally a term in the science of demographics.