In 1979 psychologist Ellen Langer carried out an experiment to find if changing thought patterns could slow ageing. But the full story of the extraordinary experiment has been hidden until now.

How much control do you have over how you will age?

Many people would laugh at the idea that people could influence the state of their health in old age by positive thinking. A way of mitigating ageing is a holy grail for the pharmaceutical and cosmetics industry, but an experiment by Harvard psychologist Ellen Langer three decades ago could hold significant clues.

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