in the prime of life

From LSJ

τοῖσι ἐμφανέσι τὰ μὴ γινωσκόμενα τεκμαιρόμενος → judge of the unknown by the known

Source

English > Greek (Woodhouse Extra)

ὡραῖος, ἡβῶν, ἀκμαῖος