Brexton Busch was just a preschooler when dad tossed him in the air in victory lane at Pocono. Kyle Busch is ready to toss Brexton the keys — OK, fine, NASCAR vehicles don’t use keys — to his truck at Kyle Busch Motorsports and have his son replace him behind the wheel. The 38-year-old Busch mapped out a succession plan that started with his retirement from the elite Cup Series when Brexton is 15 years old and ends with his son taking the full-time ride in Trucks once dad completely calls it quits from NASCAR.