"Fitness for young people is an option, fitness for old people is an imperative, " Bortz said.
CNN: The new face of fitness is getting older
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"Obviously, pain is nature's signal, but you can't be a pantywaist about pain, " said Bortz.
CNN: The new face of fitness is getting older
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Dr. Walter Bortz, author of the books "Dare to be 100" and "Living Longer for Dummies" is 77 years old, but he has run a marathon every year for the last 35 years.