Most athletes’ competitive years are in their 20s and 30s, but 61-year-old Ni Xia Lian has been playing professional table tennis for nearly 50 years. The Chinese-born Luxembourgish table-tennis player was one of the oldest athletes at this summer’s Paris Olympics. On the Science of Success, WSJ’s Ben Cohen speaks with Ni and Tommy Danielsson, her coach and husband, about how she’s maintained her longevity in competitive sports.

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