ἑξηκονταετής
From LSJ
ἑτέρως ἠδύνατο βέλτιον ἢ ὡς νῦν ἔχει κατεσκευάσθαι → otherwise they could have been constructed better than they are now (Galen, On the use of parts of the body 4.143.1 Kühn)
[Seite 881] Hippocr., zsgzg. ἑξηκοντούτης, ές, sechzigjährig, Plat. Legg. VI, 755 a VII, 812 b a. Sp.