Source : Webster's Revised Unabridged Dictionary (1913)

Age \Age\, v. i. [imp. & p. p. {Aged}; p. pr. & vb. n. {Aging}.]
   To grow aged; to become old; to show marks of age; as, he
   grew fat as he aged.

         They live one hundred and thirty years, and never age
         for all that.                            --Holland.

         I am aging; that is, I have a whitish, or rather a
         light-colored, hair here and there.      --Landor.

Source : WordNet®

aging
     adj : growing old [syn: {ageing}, {senescent}]
     n 1: the organic process of growing older and showing the effects
          of increasing age [syn: {ageing}, {senescence}]
     2: acquiring desirable qualities by being left undisturbed for
        some time [syn: {ripening}, {ageing}]