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Boundless Potential author Mark Walton explains how middle- and older-aged individuals can reinvent themselves. Included: profiles of people who've done just that, including author-surgeon Sherwin B. Nuland; former AARP executive director Horace Deets; physical therapist Marion Rosen, who created the Rosen Institute in her late 50s; and former L. A. district attorney Gil Garcetti, who turned his photography hobby into a second career. ~ Jeff Gemmill