When Dennis Berkholtz’s parents moved to a retirement home in 2004, he worried they’d get bored. “People were just playing bingo,” he recalls. But a couple of years later, Nintendo released the Wii, and Berkholtz—a former Olympic handball player and coach—saw an opportunity. With $120,000 from investors, he launched the National Senior League for Wii Bowling. Today, some 1,400 players on 280 teams compete against rivals in contests nationwide.

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