ἐν τῇ ἡλικίᾳ εἶναι

From LSJ

ἀλλ᾽ ἀμφὶ τοῖς σφαλεῖσι μὴ 'ξ ἑκουσίας ὀργὴ πέπειρα → to those who err in judgment, not in will, anger is gentle | men's wrath is softened toward those who have erred unwittingly

Source

Greek > English (Woodhouse)

be of an age for service, be of military age