Lizzie Marie Likness, the youngest on our list, runs Lizzie Marie Cuisine, a site that offers cooking tips, product reviews, and recipes. Her entrepreneurial life began at six years old: She paid for her own horseback riding lessons by selling homemade breads and cookies at farmers’ markets. Her equestrian career didn’t last (she says she rode for a year-and-a-half), but her cooking stuck. Her “Tasty Tidbits” food education project won a grant in 2007 from DoSomething.org. This past January, Likness appeared with four other young grant winners in The Kindness Challenge, a philanthropic competition run by DoSomething.org, USA Today and the Rachael Ray Show. Likness also appeared on a panel at Digitas’ NewFront 2011, discussing new media and how it affects relationships with friends and family.