She's not old enough for a driver's license. But at 15, she's the youngest U.S. Olympian.

Abby Winterberger of the U.S. after competing in the halfpipe finals in Aspen, Colo., on Jan. 10.

To understand how the freestyle skier Abby Winterberger became, at just 15 years old, the youngest member of Team USA at the Milan Cortina Winter Olympics, it’s necessary to understand her fearlessness To understand how the freestyle skier Abby Winterberger became, at just 15 years old, the youngest member of Team USA at the Milan Cortina Winter Olympics, it’s necessary to understand her fearlessness