προακμάζω
From LSJ
ὑπὸ δὲ τῆς φιλαυτίας παρηγμένοι ἄλογα φασὶν τὰ ζῷα ἐφεξῆς τὰ ἄλλα σύμπαντα → it is self-love which leads them to say that all the other animals without exception are non-rational
English (LSJ)
A ripen before the time, be premature, Hsch.s.v. πρόδρομα; arrive at puberty too early, Ruf. ap. Orib.inc.2.8. II to be at the age just before one's prime, Hp.Coac.625.