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.
Some evolutionary scientists, such as Cadell Last of The Global Brain Institute, have pointed out that this means humanity's trek through history has been marked by constant delays in our sexual maturation and the beginning of our biological reproduction, as well as an increase in our average age. And, as cultural and scientific progress marches on, this trend isn't exactly going away. We're getting older and older, and fucking later and later, until some inevitable technological advancement will bump our life expectancy to 120 or so. And boom! That's the world we live in: a global feast of elderly erotica, not unlike a never-ending episode of The Golden Girls.
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Sorry, guys. Felix Clay has dibs on Blanche.
Don't worry, though. It's not like this insane leap into a world of great-grandparent bonin' like it's nothin' is going to happen in centuries. Surely, humanity will have time to develop into a slower-aging variety that'll not be quite so ... leathery in their advanced age.
Wait, Last predicts this might happen as early as in 2050? Never mind. A world of geriatric fucking it is.