Premise: Elizabeth II . She is the world 's oldest reigning monarch as well as Britain 's longest-lived . George VI . He was succeeded by his eldest daughter , Elizabeth II . This is a list of British monarchs by longevity since the Union of the Crowns of England , Scotland and Ireland in 1603 . Queen Elizabeth II , the present British monarch ( born 21 April 1926 ; Queen since 6 February 1952 ) , is the longest lived British sovereign , at the age of .
Hypothesis: Elizabeth II was born on 21 April 1726.
Label: CONTRADICTION