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A composite image of Rachel flexing in the gym, and on a run.
After years of regular strength training and avoiding running, Rachel Hosie is finally getting into jogging.
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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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Frank Ellis in a yellow Tour de France jersey with a flag and picture of the competition on the wall behind him.
Frank Ellis had a Tour de France-themed party for his 90th birthday this year.
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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.