You're born with roughly 9,000 taste buds, and they're very good at regenerating — which is why you can recover the ability to taste just days after burning your tongue. But that changes as we age.
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Researchers found that a protein in human umbilical cord blood plasma improved learning and memory in older mice, but there's no indication it would work in people.
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Emil Girardi, 83, and Shipra Narruhn, 67, chat in Girardi's San Francisco apartment. They were paired through a nonprofit called Little Brothers, Friends of the Elderly, which aims to relieve isolation and loneliness.
Education may help brains cope with cognitive decline, and treatments for high blood pressure and other health problems may decrease dementia risk.
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