Centenarians, once a rarity, are the world's fastest growing age group: there are currently about 50,000 people over 100 in the United States alone, almost three times as many as there were in 1980. Centenarians are setting the gold standard for healthy aging. What can we learn from these pioneers? How can people decades younger apply the centenarians' longevity lessons to their own lives? These are the questions Harvard scientists Thomas Perls and Margery Hutter Silver set out to answer when they launched the New England Centenarian Study.As they probed beyond disease to identify the...