Elizabeth II
Diamond Jubilee and milestones

The 2012 Diamond Jubilee marked 60 years since Elizabeth's accession, and celebrations were held throughout her realms, the wider Commonwealth, and beyond. She and Philip undertook an extensive tour of the United Kingdom, while their children and grandchildren embarked on royal tours of other Commonwealth states on her behalf. On 4 June, Jubilee beacons were lit around the world. On 18 December, the Queen became the first British sovereign to attend a peacetime Cabinet meeting since George III in 1781.

Elizabeth, who opened the Montreal Summer Olympics in 1976, also opened the 2012 Summer Olympics and Paralympics in London, making her the first head of state to open two Olympic Games in two countries. For the London Olympics, she portrayed herself in a short film as part of the opening ceremony, alongside Daniel Craig as James Bond. On 4 April 2013, she received an honorary BAFTA award for her patronage of the film industry and was called "the most memorable Bond girl yet" at a special presentation at Windsor Castle.

In March 2013, the Queen stayed overnight at King Edward VII's Hospital as a precaution after developing symptoms of gastroenteritis. A week later, she signed the new Charter of the Commonwealth. That year, because of her age and the need for her to limit travelling, she chose not to attend the biennial Commonwealth Heads of Government Meeting for the first time in 40 years. She was represented at the summit in Sri Lanka by Prince Charles. On 20 April 2018, the Commonwealth heads of government announced that Charles would succeed her as Head of the Commonwealth, which the Queen stated as her "sincere wish". She underwent cataract surgery in May 2018. In March 2019, she gave up driving on public roads, largely as a consequence of a car accident involving her husband two months earlier.

On 21 December 2007, Elizabeth surpassed her great-great-grandmother, Queen Victoria, to become the longest-lived British monarch, and she became the longest-reigning British monarch and longest-reigning queen regnant and female head of state in the world on 9 September 2015. She became the oldest living monarch after the death of King Abdullah of Saudi Arabia on 23 January 2015. She later became the longest-reigning current monarch and the longest-serving current head of state following the death of King Bhumibol of Thailand on 13 October 2016, and the oldest current head of state on the resignation of Robert Mugabe of Zimbabwe on 21 November 2017. On 6 February 2017, she became the first British monarch to commemorate a sapphire jubilee, and on 20 November that year, she was the first British monarch to celebrate a platinum wedding anniversary. Philip had retired from his official duties as the Queen's consort in August 2017.
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