Plato, Laws 879c

ἔν τε θεοῖσι καὶ ἐν ἀνθρώποις τοῖς μέλλουσι σῴζεσθαι καὶ εὐδαιμονεῖν. αἰκίαν οὖν περὶ πρεσβύτερον ἐν πόλει γενομένην ὑπὸ νεωτέρου ἰδεῖν αἰσχρὸν καὶ θεομισές· ἔοικεν δὲ νέῳ παντὶ ὑπὸ γέροντος πληγέντι ῥᾳθύμως ὀργὴν ὑποφέρειν, αὑτῷ τιθεμένῳ τιμὴν ταύτην εἰς γῆρας. ὧδε οὖν ἔστω· πᾶς ἡμῖν αἰδείσθω τὸν ἑαυτοῦ πρεσβύτερον ἔργῳ τε καὶ ἔπει· τὸν δὲ προέχοντα εἴκοσιν ἡλικίας ἔτεσιν, ἄρρενα ἢ θῆλυν, νομίζων ὡς πατέρα ἢ μητέρα διευλαβείσθω, καὶ

An outrage perpetrated by a younger against an older person is a shameful thing to see happening in a State, and a thing hateful to God: when a young man is beaten by an old man, it is meet that, in every case, he should quietly endure his anger, and thus store up honor for the time of his own old age. Therefore let the law stand thus:—Everyone shall reverence his elder both by deed and word; whosoever, man or woman, exceeds himself in age by twenty years he shall regard as a father or a mother, and he shall keep his hands off that person, and he shall ever refrain himself, for the sake of the gods of birth, from all the generation