Origin of coetaneousClassical Latin coaetaneus ; from co-, with + aetas, age
Of equal age, duration, or period; coeval.
Origin of coetaneousFrom Late Latin coaetāneus, a contemporary : Latin co-, co- + Latin aetās, age; see aiw- in Indo-European roots.
(comparative more coetaneous, superlative most coetaneous)
From Late Latin coaetaneus (“one of the same age”).