At the age of 14, Thorpe became the youngest male ever to represent Australia, and his victory in the 400 metre freestyle at the 1998 Perth World Championships made him the youngest-ever individual male World Champion. After that victory, Thorpe dominated the 400 m freestyle, winning the event at every Olympic, World, Commonwealth and Pan Pacific Swimming Championships until his break after the 2004 Olympics in Athens. At the 2001 World Aquatics Championships, he became the first person to win six gold medals in one World Championship. Aside from 13 individual long-course world records, Thorpe anchored the Australian relay teams, numbering the victories in the 4 × 100 m and the 4 × 200 m freestyle relays in Sydney among his five relay world records. His wins in the 200 m and 400 m and his bronze in the 100 m freestyle at the 2004 Summer Olympics made him the only male to have won medals in the 100–200–400 combination. He acquired the nickname "Thorpedo" because of his speed in swimming. Thorpe announced his retirement from competitive swimming in November 2006, citing waning motivation; he made a brief comeback in 2011 and 2012.