Ray Wilder has been president of both the major mathematical organizations in the U.S.; he was a member of the National Academy, and the author of several books and many articles. When he was 80, fifteen years after he retired from the University of Michigan, he told me that his days of study were definitely not over (and neither was the feel ing of pressure that makes one study): he was still reading mathematics, going to colloquia, and trying to keep up with what was going on.
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