The U.S. Senior National Championships is an event for athletes age 50 and above. The winners of this annual championship, which is normally held in January, represent the U.S. at the World Senior Championships. The event is not regionally based and teams do not have to qualify to participate, rather it is a "sign up and go" event. The championship format depends upon the size of the field. The event began in 2002 to coincide with the inaugural World Senior Championship, which the U.S. men won.