The Republic · ¶174

The parents ought to be in the prime of life, which for a man may be reckoned at thirty years—from twenty-five, when he has ‘passed the point at which the speed of life is greatest,’ to fifty-five; and at twenty years for a woman—from twenty to forty. Any one above or below those ages who partakes in the hymeneals shall be guilty of impiety; also every one who forms a marriage connexion at other times without the consent of the rulers. This latter regulation applies to those who are within the specified ages, after which they may range at will, provided they avoid the prohibited degrees of parents and children, or of brothers and sisters, which last, however, are not absolutely prohibited, if a dispensation be procured. ‘But how shall we know the degrees of affinity, when all things are common?’ The answer is, that brothers and sisters are all such as are born seven or nine months after…

Plato · translated by Benjamin Jowett · composite transcription based on the 1888 third edition
Benjamin Jowett, revised third edition (1888), with Stephanus numbering from the 1908 edition; composite transcription, Project Gutenberg #55201
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