Twenty-sixth Amendment to the United States Constitution

The Twenty-sixth Amendment (Amendment XXVI) to the United States Constitution prohibits the states and the federal government from using age as a reason for denying the right to vote to citizens of the United States who are at least eighteen years old. The drive to lower the voting age from 21 to 18 grew across the country during the 1960s, driven in large part by the broader student activism movement protesting the Vietnam War. The impetus for drafting an amendment to lower the voting age arose following the Supreme Court's decision in Oregon v. Mitchell, 400 U.S. 112 (1970), which held that Congress may establish a voting age for federal elections, but not for local or state elections.

On March 23, 1971, a proposal to extend the right to vote to citizens eighteen years of age and older was adopted by both houses of Congress and sent to the states for ratification. The amendment became part of the Constitution on July 1, 1971, three months and eight days after the amendment was submitted to the states for ratification, making this amendment the quickest to be ratified.

Section 1. The right of citizens of the United States, who are eighteen years of age or older, to vote shall not be denied or abridged by the United States or by any State on account of age.

Section 2. The Congress shall have the power to enforce this article by appropriate legislation.

Senator Harley Kilgore began advocating for a lowered voting age in 1941 in the 77th Congress. Despite the support of fellow senators, representatives, and First Lady Eleanor Roosevelt, Congress failed to pass any national change. However, public interest in lowering the vote became a topic of interest at the local level. In 1943 and 1955 respectively, the Georgia and Kentucky legislatures passed measures to lower the voting age to 18.

...
Wikipedia