And now the 91-year-old monarch is set for yet another big milestone: 66 years on the throne, as February 6 marks the death of her father, King George VI, and also the day she became Queen.
Known as Accession Day, the Queen normally spends it in quiet, somber reflection at Sandringham House, as it marks the death of her beloved father as much as the day that her public life changed forever. Around the time, she often takes part in a low-key engagement close to her estate in Norfolk.
Soon after the date passes, she’ll head south to London and Windsor Castle for a fuller set of public and behind-closed-doors work, such as audiences with diplomats and meetings with the U.K. Prime Minister Theresa May.
Last weekend, the Queen and Prince Philip were greeted by hundreds of well-wishers for their final Sunday church visit in the village of West Newton before they leave Norfolk.
The next milestone? Her 92nd birthday on April 21.