Saudi Arabia is considered both a regional and middle power. The Saudi economy is the largest in the Middle East and eighteenth-largest in the world. Saudi Arabia also has one of the world's youngest populations, with approximately 50 per cent of its population of 34.2 million being under 25 years old. In addition to being a member of the Gulf Cooperation Council, Saudi Arabia is an active and founding member of the United Nations, Organisation of Islamic Cooperation, Arab League, and OPEC.