Barely two hours after his horse, Justify, became thoroughbred racing's 13th Triple Crown winner, Dallas' Kenny Troutt declared "I'm worn out!" though he sounded exuberant.Why wouldn't he? Just 18 years after purchasing a Versailles, Kentucky horse farm and renaming it WinStar, 70-year-old Troutt stands atop his sport's summit.Justify wire's wire-to-wire victory in Saturday's Belmont Stakes in Elmont, N.Y., was fittingly dominant for a chestnut 3-year-old that has won all six of his career races, in an 111-day span."I was screaming and yelling," Troutt told The Dallas Morning News Saturday night as he and his sons, Preston and Grant, headed for a New York airport to fly home to Dallas.