The Rocky Mountain Senior Games are Colorado's qualifying event for the biennial Summer National Senior Games. The City of Greeley has partnered with the Colorado Senior Sports Development Council (CSSDC) to bring the Rocky Mountain Senior Games to Colorado. CSSDC is the governing board of the Rocky Mountain Senior Games and is a 501(c)3 non-profit organization. CSSDC and the Recreation Division of the City of Greeley Leisure Services Department work together to coordinate the Games. Athletes of all abilities are encouraged to participate in over 25 sports which include 87 events and several fun social activities. Age categories begin at 50, and for most sports increase in five year increments (for example 50-54, 55-59, etc). Competition is divided into male and female divisions, as well as mixed competition in several doubles events.