On 30 June, the 26th Amendment to the U.S. constitution was ratified by Congress, thus lowering age in all elections to 18 years of age.
Richert, Lucas Paul. "26th Amendment ratified". The Literary Encyclopedia. First published 01 November 2008; last revised 30 November -1.
[http://www.litencyc.com/php/stopics.php?rec=true&UID=5685, accessed 28 April 2015.]