I want to know the answer to the following question:
How old was Elizabeth's father at the time of his death?
All the background I'm provided with is that "Moments of sadness for her include the death of her father, aged 56; the assassination of Prince Philip's uncle, Lord Mountbatten; the breakdown of her children's marriages in 1992 (her annus horribilis); the death in 1997 of her son's former wife, Diana, Princess of Wales; and the deaths of her mother and sister in 2002.". Is that enough to answer the question?