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In 2014, after she won a Kindle in a raffle, Rosanne Clementi found herself suddenly addicted to tablets. But there was one problem: It was difficult for her to hold due to arthritis in both her thumbs. “I fidgeted a lot and couldn't get comfortable,” Clementi says. “I wanted to put handles on this device.”

That's when the 63-year-old decided to dive into product development and use her retirement money to create a product that adds handles to any tablet device. She calls it the Pad Go Round.

Entering entrepreneurship: The Pad Go Round isn't Clementi's first entrepreneurial venture. She started an environmental consulting firm in 1995 with a business partner. After they parted ways, she reopened her own firm in 2009, which still pays the bills today.