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In page Suffrage:

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All modern democracies require voters to meet age qualifications to vote.[citation needed] Worldwide voting ages are not consistent, differing between countries and even within countries, though the range usually varies between 16 and 21 years. The United Kingdom was the first major democratic nation to extend suffrage to those 18 and older in 1969.[1][2] The movement to lower the voting age is one aspect of the Youth rights movement. Demeny voting has been proposed as a form of proxy voting by parents on behalf of their children who are below the age of suffrage.