Carl Lindner Jr.

Age: 91
Schooling: Dropped out of school at 14
Hometown: Norwood, Ohio
Money made: Convenience stores
Best-known venture: United Dairy Farmers

In 1938, when Carl Lindner Jr. was 19, most milk was delivered by milkmen. Carl Lindner Sr. came up the idea of selling milk from the family's dairy farms in grocery stores, eliminating a lot of delivery costs. Carl Jr. and three siblings helped support the family by running milk routes through the Depression, then expanded the business into what would become one of the Midwest's largest chains of convenience stores, Cincinnati-based United Dairy Farmers. Eventually Lindner branched into insurance and real estate. From 1999 to 2006, he owned a controlling interest in the Cincinnati Reds of Major League Baseball.