Lewis & Short

longaevus, a, um, adj. [longus-aevum],

  1. I. of great age, aged, ancient (poet.): parens, Verg. A. 3, 169; cf. id. ib. 2, 525: senes, id. ib. 5, 715: caput, Prop. 4 (5), 1, 52: pons, Stat. Th. 10, 864: senecta, Prop. 2, 10, 47 (3, 5, 31): vetustas, Mart. Spect. 5.
  2. II. Subst.: longaeva, ae, f., an old woman: cunctantem longaeva manu deducit, Ov. M. 10, 462.