Katrina Mumaw was once the ‘world’s fastest kid’. She earned that title at the age of 11 when she convinced her instructor to let her fly a Russian fighter jet and became the youngest person to pilot a MIG-29. On that same flight, she also became the youngest person to break the sound barrier after reaching the speed of Mach 1.3, then celebrated by doing a series of military-style maneuvers and aerobatics. Source Source 2 Source 3