Article continues below advertisementJust days before Princess Diana's untimely death at the age of 36, she confided in a close pal that she had one major life regret.The late Princess of Wales felt immense remorse for her sons, Prince William and Prince Harry, about doing her infamous 1995 BBC Panorama interview.Article continues below advertisementPrincess Diana Died in 1997Source: MEGAPrincess Diana was just 36 years old when she died.Diana died in a car crash in Paris on August 31, 1997. 10 days prior, she went on a vacation to Greece with friend Rosa Monckton.