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The present paper aims to highlight the origin of the youth movements in Iran during the intervening years of 1971 and 2002. During these three decades, youth movement was one of the important social movements in the political arena of the country. While explaining the origin of the movement, two changes i.e. 'generation gap' and 'democracy' have been studied and it was found that the origin of the youth movements in Iran was due to the contradictions between authoritarianism and democracy. Apart from various official statistics and figures, some results of some opinion surveys have also been utilized to analyze this paper.