People 65 and older can get better with age, study shows. This is the key.

When Diana Nyad was 64 years old, she swam 110 miles from Cuba to Florida, becoming the first person to do so without a shark cage. It was her fifth attempt over the course of 3½ decades. “I said when I did that swim, which was 12 years ago, that that was the prime of my life,” Nyad said during a p...

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