δεκάχρονος
From LSJ
εἰ γάρ κεν καὶ σμικρὸν ἐπὶ σμικρῷ καταθεῖο καὶ θαμὰ τοῦτ᾽ ἔρδοις, τάχα κεν μέγα καὶ τὸ γένοιτο → for if you add only a little to a little and do this often, soon that little will become great (Hesiod W&D, 361-362)
Spanish (DGE)
-ον
métr. de diez unidades de tiempo μολοσσοσπονδεῖος ἐκ πέντε μακρῶν δ. Anecd.Stud.1.235.