When Dr. David Lemon began his great adventure as a cardiologist in the Midwest, he and his colleagues agreed that anyone over the age of seventy was ?over the hill.' Then a funny thing happened as time went on and patients in his office lived longer than ever before. Dr. Lemon discovered that seventy was not so old after all. Determined to learn what makes people greater than ninety years old tick, Dr. Lemon asked over one hundred and twenty senior...
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