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If you are asking about the United States, the change took place in 1971, as a result of the 26th Amendment to the Constitution, which gave 18 year olds the right to vote. There had been some discussion of doing this as early as World War II, but many historians credit the controversy over the Vietnam War with giving momentum to lowering the voting age. After the 26th Amendment was ratified in July 1971, it became official.

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8y ago

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