Athletes can elect to compete in the age group of which their age falls on July 1, 2019 of the year of the start of the season. Additionally, an athlete can choose to compete up one age grouping. An athlete can petition to the FINA board to compete in a grouping that exceeds one age grouping up.
Masters athletes can choose to compete in either the Adult or the Masters division.
For all athletes, the age grouping for the entire season will be determined by the age grouping competed in during their first competition of the season.