On fidelity and other trifles
‘For as long as we both shall live’: how long might this be? To back up Litlove’s recent illustration of this question, let me point out that a couple of centuries ago, people who had survived to the age of marriage could reasonably expect to live until 40. This means that roughly half the people died before that age. Therefore, the probability that someone would stay married to the same person for more than 20 years was at most one in four. Nowadays, the probability that both husband and wife
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