A Scout (in some countries a Boy Scout) is usually between 11 to 18 years of age. Because of the large age and development span, many Scouting associations have split this age group in a junior and a senior section. Scouts are organized into troops averaging twenty to thirty Scouts under guidance of one or more Scout Leaders. Troops subdivide into patrols of about six Scouts and engage in outdoor and special interest activities. Some national Scouting associations have special interest programs such as Air Scouts, Sea Scouts, outdoor high adventure, Scouting bands, and rider scouts.