1. thirty years old , (Plato Philosophus); in contracted form, οἱ τριακοντοῦται the men of thirty years , (Plato Philosophus); feminine τριακοντοῦτις (Isaeus Orator)

2. τριακονταέτης, ες, of or for thirty years , (Thucydides);—;in feminine form, σπονδαὶ τριηκοντουτίδες (Herdotus Historicus); αἱ τριακοντούτιδες σπονδαί (Aristophanes Comicus) (ML)