sechzigjährig
From LSJ
Δελφῖνα νήχεσθαι διδάσκεις: ἐπὶ τῶν ἐν ἐκείνοις τινὰ παιδοτριβούντων, ἐν οἷς ἤσκηται → Teaching dolphins to swim: is applied to those who are teaching something among people who are already well versed in it
German > Latin
sechzigjährig, sexaginta annorum (im allg). – sexagenarius. sexaginta annos natus (von Pers.). – s. Männer, viri sexagenûm annorum.