The number of mutations in the genomes of one’s children (and thus the likelihood of features like autism and ugliness) increases with paternal age. Surely this is a feature and not a bug? If a man finds a partner willing to bear his children as soon as he passes puberty he is likely to be a decent bet, and so his characteristics pass down to his offspring with the minimum of alterations. The older he becomes the greater the likelihood that he is a bit of duffer, and so more of the cards in his hand get replaced with ones from the pack. The mean quality of his kids drops but the standard deviation rises…


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