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LONDON, UNITED KINGDOM - AUGUST 4: File photo dated 04 August 2000 shows Queen Elizabeth, the Queen Mother celebrating her 100th birthday from the balcony of Buckingham Palace. Thousands of people have flocked to the streets outside Buckingham Palace to cheer the Queen Mother, the longest living royal in the history of the British monarchy. (Photo credit should read IAN WALDI/AFP via Getty Images)

LONDON, UNITED KINGDOM - AUGUST 4:  File photo dated 04 August 2000 shows Queen Elizabeth, the Queen Mother celebrating her 100th birthday from the balcony of Buckingham Palace. Thousands of people have flocked to the streets outside Buckingham Palace to cheer the Queen Mother, the longest living royal in the history of the British monarchy.  (Photo credit should read IAN WALDI/AFP via Getty Images)

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LONDON, UNITED KINGDOM - JUNE 17: The Queen Mother With The Countess Of Wessex [sophie] And Prince Edward Waving To The Crowds From The Balcony Of Buckingham Palace On The Queen's Official Birthday. (Photo by Tim Graham Photo Library via Getty Images)

LONDON, UNITED KINGDOM - JUNE 17:  The Queen Mother With The Countess Of Wessex [sophie] And Prince Edward Waving To The Crowds From The Balcony Of Buckingham Palace On The Queen's Official Birthday.  (Photo by Tim Graham Photo Library via Getty Images)

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LONDON, UNITED KINGDOM - MAY 08: Queen Elizabeth Ll, Queen Mother And Princess Margaret On The Balcony Of Buckingham Palace On Ve Day. (Photo by Tim Graham Photo Library via Getty Images)

LONDON, UNITED KINGDOM - MAY 08:  Queen Elizabeth Ll, Queen Mother And Princess Margaret On The Balcony Of Buckingham Palace On Ve Day.  (Photo by Tim Graham Photo Library via Getty Images)

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LONDON, UNITED KINGDOM - AUGUST 04: The Queen Mother waves to well-wishers during the celebration of her 90th birthday on August 4, 1990 in London, England. (Photo by Georges De Keerle/Getty Images)

LONDON, UNITED KINGDOM - AUGUST 04:  The Queen Mother waves to well-wishers during the celebration of her 90th birthday on August 4, 1990 in London, England.  (Photo by Georges De Keerle/Getty Images)

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LONDON, UNITED KINGDOM - AUGUST 4: Britain's Queen Elizabeth II (C) smiles at Queen Mother (L) with other members of the royal family on the occasion of the Queen Mother's 99th birthday at her London residence Clarence House, 04 August 1999. (R to L:) Princess Margaret, the younger sister of Britain's Queen Elizabeth II, Princess Anne, Prince Harry, Prince Charles, Prince Edward, Prince Andrew and others congregated for a family photograph celebrating the beginning of the well-loved royal's 100th year. (ELECTRONIC IMAGE) (Photo credit should read JONATHAN UTZ/AFP via Getty Images)

LONDON, UNITED KINGDOM - AUGUST 4:  Britain's Queen Elizabeth II (C) smiles at Queen Mother (L) with other members of the royal family on the occasion of the Queen Mother's 99th birthday at her London residence Clarence House, 04 August 1999. (R to L:) Princess Margaret, the younger sister of Britain's Queen Elizabeth II, Princess Anne, Prince Harry, Prince Charles, Prince Edward, Prince Andrew and others congregated for a family photograph celebrating the beginning of the well-loved royal's 100th year.  (ELECTRONIC IMAGE)  (Photo credit should read JONATHAN UTZ/AFP via Getty Images)