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").
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