The Collaborative International Dictionary of English v.0.48:

Coeval \Co*e"val\, a. [L. coaevus; co- + aevum lifetime, age.
   See Age, n.]
   Of the same age; existing during the same period of time,
   especially time long and remote; -- usually followed by with.
   [1913 Webster]

         Silence! coeval with eternity!           --Pope.
   [1913 Webster]

         Oaks coeval spread a mournful shade.     --Cowper.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Coeval \Co*e"val\, n.
   One of the same age; a contemporary.
   [1913 Webster]

         As if it were not enough to have outdone all your
         coevals in wit.                          --Pope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

coeval
    adj 1: of the same period [syn: coetaneous, coeval,
           contemporaneous]
    n 1: a person of nearly the same age as another [syn:
         contemporary, coeval]