By John Werner – Forbes

Ever since the fountain of youth, longevity has been a big quest for humanity. We want to get there, but historically, we just don’t quite know how.

Enter Dr. John Day, who is a cardiologist and marathon runner,who wanted to know the secrets of staying healthy long-term – and living longer. (He’s also penned a book on longevity here.)

In a recent TED talk that I produced, he started by explaining what’s going on with Americans.

“The average life expectancy (of an American) is 79, yet the average American is disabled by 69,” he said. “That means they’re spending the last ten years of their life going from doctor to doctor, being prescribed medication. The sad thing is, studies suggest that most of us can live to age 90 in good health. Just don’t screw things up. And so in essence, we leave 21 good years of life on the table.”

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