The Aran Islands are an official Gaeltacht, which gives full official status to Irish as the medium of all official services, including education. An unusually high rate of Irish-language monolingualism was found among senior natives until the end of the 20th century, in large part because of the isolating nature of the traditional trades practised and the natural isolation of the islands in general from mainland Ireland over the course of the islands' history. Young islanders can take their leaving examination at 18 on the islands, and then most leave for third-level education. Many blame the decline of Irish-speaking among young members of the island community on English-language television, available since the 1960s; furthermore, many younger islanders leave for the mainland when they come of age.