A group of men sit in a monastery converted to a hotel lobby in 1959 chatting about current events. Fidel Castro is causing an uproar after taking over Cuba, parents are standing in line to buy their daughters a first edition Barbie, Alaska and Hawaii aren’t states yet, and The USSR just put the first manmade object on the moon.
But outside, things are different. It’s 1981 and the talk of the day is the outrageous inflation rate, Lady Diana’s marriage to Prince Charles, and American Airlines’ new frequent flyer program.
The space between these two worlds—one real and one an elaborate reenactment—was created by Ellen Langer, a pioneering psychologist conducting an experiment on the power of your mind to stop—or even reverse—the effects of aging.
She was trying to answer a preposterous question: Will putting someone’s mind in a younger era cause their body to follow? The answer was equally preposterous: yes.
Compared to a control group who lived in the same conditions, the men who walked into the experiment (slouched and aided by canes) five days earlier walked out taller, smarter, and more independent. They were physically stronger, mentally sharper, and they could see and hear better. They even looked younger to people who were unaware they’d been part of an aging experiment. 
If an experiment like this tells us anything, it’s that your mind plays an incredibly powerful role in the health of your body, and there are simple things you can do to both look, feel, and perform like you’re younger.