 On 30 March 2002 , at 15 : 15 ( GMT ) , the Queen Mother died in her sleep at the Royal Lodge , Windsor Great Park , with her surviving daughter , Queen Elizabeth II , at her bedside . She had been suffering from a cold for the last four months of her life . She was 101 years old , and at the time of her death was the longest @-@ lived member of the royal family in British history . This record was broken on 24 July 2003 , by her last surviving sister @-@ in @-@ law Princess Alice , Duchess of Gloucester , who died aged 102 on 29 October 2004 . 
