Medicine: Vigorous Middle Age

Dr. Thomas Kirk Cureton is a man of 49 who says he feels 35. It is no idle boast. He can prove it with physical-fitness tests in which he ranks consistently next to Track Stars Gil Dodds, 32, and Craig Dixon, 25.

Dr. Cureton, director of the Physical Fitness Research Laboratory at the University of Illinois, has spent the last five years testing the physical condition of 2,000 "middleaged" men (26 to 60, by his classification) from a dozen or more professions and trades. He has put more than 500 of them through a...

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