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Billionaires are backing top scientists racing to develop tech that could reverse aging. Cellular reprogramming promises to rejuvenate the body — but how does it work, and is it safe?

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Jeannie in New York
Jeannie Kim was 55 when she was diagnosed with breast cancer.
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Composite image of Dr. Michael Roizen, someone pouring fish oil supplements into their hand; some uncooked mushrooms.
Dr. Michael Roizen shared some of the supplements he takes every day.
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A woman sleeping peacefully in bed in the morning in natural lighting.
Sleeping late on the weekends to catch up after a busy week can pay off, according to science
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Nutrition coach Mike Molloy stands with his arms crossed, looking into the camera.
Nutrition coach Mike Molloy shared how he advises clients to boost their longevity.
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A woman in workout clothes doing a lunge twist exercise for flexibility in the gym
Better flexibility is linked to a lower risk of dying early, new research suggests. Exercises like yoga could help.
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Fabrizio Villatoro and Ben Meyers with María Branyas Morera, the oldest living person in the world.
Longeviquest centenarian experts with María Branyas Morera, who was the oldest living person in the world before she died.
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Vijaya Srivastava swimming in a white swimming cap.
Srivastava learned to swim at 68 years old, and now swims three times a week.