What are the implications for marriage and dating when scientists cure aging and humans can live vastly extended lives? If we live to 200 or 300 years old, will we still be monogamous?
It seems to me that the answer is no. When we get married, we forgo all future romantic relationships. In today’s world, where you might expect to live into your 80s or 90s, the opportunity cost of marriage is relatively low. If I get married at 30, then I’m giving up 50 to 60 years of single life. But as every year passes, the returns to bachelorhood decline. Every year I’m a little more wrinkled and my body is a little less defined. Financial success can offset these losses in physical appeal, but only up to a certain point. The 70-year-old millionaire isn’t much competition in dating terms for a fit 30-year-old who makes $70,000 a year.
But all that changes if I’m not aging anymore. If my nominal age is 95, but my biological age is 42, then I’ll still be an attractive mate. And so the costs of marriage skyrocket. Instead of forgoing 15-20 years of eligible bachelor status, I’ll be forgoing 150-250 years of eligibility.
My prediction is that people will still get married but on more of an ad hoc basis. We’ll get married for say 30 years, during which we’ll join together with a mate for the purpose of raising children, but these relationships will end amicably and people will go their separate ways, to start new families with new mates.