(n.) One of the same age; a contemporary.

accompanying agreeing atavistic bodily born coetaneous coeternal coexistent coexisting coinstantaneous collateral concomitant concurrent congenital connatal connate connatural constitutional contemporaneous contemporary conterminous coterminous dead heat draw genetic hereditary in the blood inborn inbred incarnate indigenous inherited innate instinctive instinctual isochronal isochronous native native to natural natural to organic physical primal simultaneous synchronal synchronic synchronous temperamental tie unison unisonous