How old a man is may have little to do with his age in years. Some men age much faster than others, so that doctors have said: "A man is as old as his arteries." The difficulty has been to find a way of measuring physiological age. Now, the University of California's Dr. Hardin Jones and his colleagues think they have the answer in the amount of blood flowing through the tissues. The more blood the younger the tissues, and hence the younger the body.
At first Dr. Jones had to measure the blood flow by holding a Geiger counter over the...
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