The Scout movement is the largest youth organisation in the world with 25 million members in 150 Scout organisations. Only five countries do not have any Scout movements.
In the U.K. there are five sections for young members:
Beaver Scouts (for 6 - 8 years),
Cub Scouts (for 8 - 10½ years),
Scouts (for 10½ - 14 years),
Explorer Scouts (for 14 - 18 years), and
Scout Network (18 - 25 years).