Ratification Document for the 26th amendment from Illinois
In 1954 and 1968 Presidents Dwight D. Eisenhower and Lyndon B. Johnson, respectively, championed the cause of an amendment to the Constitution lowering the voting age to 18. In 1971 Senator Randolph reintroduced his original proposal, and it passed overwhelmingly. Ratification was accomplished in a record four months.
National Archives, General Records of the U.S. Government