sentences:  When second or subsequent marriages are included the oldest monarch at the time of his marriage was Edward I, whose second marriage was to Margaret of France in 1299 when he was old and she was no more than 20.The oldest queen consort at the time of her marriage was Maud, Countess of Huntingdon, who married David I when she was around 40 years old.The longest marriage of a British sovereign is between Elizabeth II and Prince Philip, who have been married since 20 November 1947, making their marriage old.