In two years, she would overtake Louis XIV of France who reigned for more than 72 years.
The Queen, who has mobility problems, has been taking on fewer official duties recently with her family members - notably the Cambridges and Prince Charles and Camilla - taking a more prominent role.
She delighted many by appearing on the Buckingham Palace balcony during the Jubilee weekend and it is not yet known when she will appear in public next. One occasion could be Royal Ascot, a favourite event of the horse-loving Queen which is taking place this week, but she missed last year's meet. At the close of the Jubilee weekend, she said in a letter of thanks to the British public that she was "humbled and deeply touched" by the number of people to have celebrated alongside her.
She was absent at some of the events, but said "my heart has been with you all", adding: "I remain committed to serving you to the best of my ability, supported by my family."
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