There isn't a history of extreme longevity prior to the Queen Mother, but Elizabeth's Great-Grandmother Alexandra was about 80 when she died in 1925, and Victoria was 81 when she died in 1901. Not bad for those times. Her Great-Aunt by blood, Princess Alice of Athlone lived to 97, dying in 1981 I think, and her Aunt by marriage, Princess Alice, Duchess of Gloucester surpassed the age of the Queen Mother and died at 102 in 2004, I think. Interestingly, the ones who live the longest have tended to marry into the family, rather than being part of the royal bloodline. The Luxembourghish royals seem to have good genes, with a number making it into their 90s in recent years.