Shortly after Boy Scouting was founded in the United States, its creators encountered a problem with older boys. Some grew bored with the program, usually around 14–15, while others didn't want to leave their troops after reaching the age of 18. To alleviate this problem, a number of new programs were created for older boys over time, including the Sea Scouts (1912), Senior Scouts and Explorer Scouts (1935), Rover Scouts (c. 1938), and Air Scouts (1942). Around 1935, most of these were brought together under the overall Senior Scout Division. In 1949, these programs were reworked into Exploring, which included Sea Explorers and Air Explorers. In 1958, these were further re-worked and condensed into a unified Exploring program with Air Explorers and Sea Explorers as relatively independent sub-groups.