coetaneous \koh-i-TEY-nee-uhs\, adjective:
Of the same age or duration.
Bear with these distractions, with this coetaneous growth of the parts: they will one day be members, and obey one will.
-- Ralph Waldo Emerson, Self-Reliance and Other Essays
We could say that all living people are contemporaneous but not necessarily coetaneous; they live at different age levels.
-- Harold C. Raley, A Watch Over Mortality
Coetaneous stems from the Latin roots co- meaning "with, together with," ætat- meaning "age," and the suffix -aneus (which is an adjectival suffix meaning "resembling").
