Career
In 2011 he set the world record of the Ironman World Championship in the Men"s 70-74 age group with a time of 11 hours 14 minutes. In 2006, 2007, and 2008 he was awarded the Canadian Grand Master Athlete of the Year by Triathlon Canada. He was selected as Triathlon Magazine Canada"s athlete of the year for 2012.
Kostic attended the University of British Columbia as a foreign student from Belgrade, Yugoslavia (now Serbia).
After obtaining a degree in engineering, he remained in Canada, moving to Regina. 2006 Saskatchewan Sport, Masters Athlete of the Year
2006 Triathlon Canada, Masters Long Distance Triathlon Athlete of the Year
2007 Triathlon Canada Grand Master (60+) Male Athlete of the Year
2007 Triathlon Magazine Canada, Masters Athlete of the Year
2008 Triathlon Canada Grand Master (60+) Male Athlete of the Year
Ironman Canada Iron Spirit Award, August 30, 2009
2009 Triathlon Magazine Canada, Age Group Triathlete of the Year
2012 Triathlon Magazine Canada, Triathlete of the Year
In June of 2015 was inducted into the Saskatchewan Sports Hall of Fame.