The <a href="https://en.wikipedia.org/wiki/Twenty-sixth_Amendment_to_the_United_States_Constitution" id="mwAQM" rel="mw:WikiLink" title="Twenty-sixth Amendment to the United States Constitution">Twenty-sixth Amendment to the United States Constitution</a>, lowering the <a href="https://en.wikipedia.org/wiki/Voting_age" id="mwAQQ" rel="mw:WikiLink" title="Voting age">voting age</a> from 21 to 18 years, is formally certified by <a href="https://en.wikipedia.org/wiki/President_of_the_United_States" id="mwAQU" rel="mw:WikiLink" title="President of the United States">President</a> <a href="https://en.wikipedia.org/wiki/Richard_Nixon" id="mwAQY" rel="mw:WikiLink" title="Richard Nixon">Richard Nixon</a>.