per-vĕtus, ĕris, adj.,
very old : signum ligneum, Cic. Verr. 2, 4, 3, § 7: oppidum, id. ib. 2, 4, 33, § 72: amicitia, id. Fam. 13, 17: epistula sed sero allata, id. Q. Fr. 3, 1, 4, § 14: vinum non pervetus, Cels. 5, 26, 30.
per-vetus eris, adj.,very old, most ancient: signum ligneum: amicitia: tempora. ...
An Elementary Latin Dictionary