EUGENE, Ore. (AP) — Allyson Felix is headed to her fifth Olympics. But she appears more of the exception on a U.S. track and field team that’s trending toward youth. There are quite a few first-timers and collegians heading to the Tokyo Games wearing the red, white and blue. There’s a teen sprinter from Florida named Erriyon Knighton who’s breaking Usain Bolt’s youth records. LSU long and high jumper JuVaughn Harrison is accomplishing things not see since the days of Jim Thorpe in 1912. And 19-year-old Athing Mu broke the U.S. meet record in the 800 meters. She’s from New Jersey and runs for Texas A&M.