Dr. Robert Butler, 81, says he felt a need to "sum up" all he has learned in 50 years of studying longevity. "This was a hard book to write," he says of his massive tome, "The Longevity Revolution" (Public Affairs, 2008). 'There is a paradox. On one hand, longevity is a great human achievement, and on the other ...

Dr. Robert Butler, 81, says he felt a need to "sum up" all he has learned in 50 years of studying longevity. "This was a hard book to write," he says of his massive tome, "The Longevity Revolution," (Public Affairs, 2008). "There is a paradox. On one hand, longevity is a great human achievement and on the ...