The World Junior Figure Skating Championships, often informally called "Junior Worlds" or "World Juniors", were for many years held in late November or December. Following the 1998–1999 season, they were moved to late February/early March, and have been held after the Four Continents Championships. Even when they were held before the New Year, the events were officially referred to by the next calendar year, and the champions are listed in results by that year. For example, Ilia Klimkin, who won it in November 1998, is officially the 1999 World Junior champion. By ISU regulation, the World Junior Championships should be held in the first half of March. The World Junior Championships are open to skaters who fit into a certain age category. Currently, skaters must be between the ages of 13 and 19 (or 13 and 21 for the men in pairs and ice dance) in order to compete.