How Did An 8-Year-Old Sell 32,000 Boxes Of Girl Scout Cookies? Entrepreneur 7 hrs ago Meet Lilly Bumpus. Lilly is 8 years old. And she’s sold more than 32,000 boxes of Thin Mints, Caramel deLites, Do-si-dos and S'mores this year. No, this is not a joke. Lilly holds the single season record for selling Girl Scout cookies. Did I forget to mention she’s 8 years old? "She sold her freaking heart out till the last day of Girl Scout cookie season," Lilly's mom, Trish Bauer, told Mercury News. "It's Lilly being Lilly. She does not like somebody telling her something is not possible."