Professor Norman Lazarus, aged 82, has the immune system of a 20 year old.
Doing lots of exercise in older age can prevent the immune system from declining and protect people against infections, scientists say.
Prof Norman Lazarus, 82, of King's College London, took part in and co-authored the research, said: "If exercise was a pill, everyone would be taking it.
"It has wide-ranging benefits for the body, the mind, for our muscles and our immune system."
More details from the BBC
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