Plato, Laws 880a

ἄπαιδα προέχοντα ἡλικίᾳ ἑαυτοῦ ἐὰν τύπτῃ, γέρων τε γέροντα καὶ ἐὰν νέος νέον, ἀμυνέσθω κατὰ φύσιν ἄνευ βέλους ψιλαῖς ταῖς χερσίν· ὁ δὲ ὑπὲρ τετταράκοντα γεγονὼς ἔτη ἐὰν τολμᾷ τῳ μάχεσθαι, εἴτε ἄρχων εἴτε ἀμυνόμενος, ἄγροικος καὶ ἀνελεύθερος ἂν λεγόμενος ἀνδραποδώδης τε, δίκης ἂν ἐπονειδίστου τυγχάνων τὸ πρέπον ἔχοι. καὶ ἐὰν μέν τις τοιούτοις παραμυθίοις εὐπειθὴς γίγνηται, εὐήνιος ἂν εἴη· ὁ δὲ δυσπειθὴς καὶ μηδὲν προοιμίου φροντίζων δέχοιτʼ ἂν τὸν τοιόνδε

whether it be a case of an old man beating an old man, or of a young man beating a young man,—the man attacked shall defend himself with bare hands, as nature dictates, and without a weapon. But if a man over forty ventures to fight, whether as aggressor or in self-defence, he shall be called a knave and a boor, and if he finds himself incurring a degrading sentence, he will be getting his deserts. Any man who lends a ready ear to such exhortations will prove easy to manage; but he that is intractable and pays no regard to the prelude will hearken readily