The Brief A 16-year-old North Texas high school student, Cooper Lutkenhaus, broke the world record for the 800-meter race for his age group. Lutkenhaus finished second at the USA Track & Field Outdoor Championships, earning a spot on the U.S. team. A North Texas teenager broke records over the weekend at the USA Track & Field Outdoor Championships. Cooper Lutkenhaus, who attends Northwest High School in Denton County, is only 16 years old. He and his cross-country coach Chris Chapeau plan to continue training at the Northwest High School track, lifting weights and running about 30 miles per week.