Still, maybe we should better start adjusting to the idea of wrinkly, leathery things rubbing together, because not only will you become old one day, that shit is not some temporary "old people these days, amirite?" style trend that'll eventually go away. At least, not according to life history theory, which indicates that humanity could very well be looking at a future where all sex is old-people sex.
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And you thought Thanksgiving dinner conversations were awkward before.
Here's how it works! Good old natural selection gives an organism two basic survival tactics: It either produces as much offspring as quickly as it can to ensure at least some of them survive, or takes its time to carefully rear its kid to become badass enough to increase its odds of not getting immediately stomped by the nearest mammoth. Humanity has long employed the latter tactic -- and has gotten pretty damn good at it. Our nurturing period is longer than any other primate's, and modern amenities are only making it easier to stay a kid for a longer time. Shit, some of us manage it well into our 30s.