Based on Rosenfeld's study of very old men, approximately what percentage of 90-year-old Walter's 90-year-old male friends feel that their lives were rich and rewarding?

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According to Rosenfeld's study, approximately 50% of the very old men felt that their lives were rich and rewarding. Therefore, it is reasonable to assume that around 50% of Walter's 90-year-old male friends would feel the same way.

Based on Rosenfeld's Study of Very Old Men, Approximately What