Article continues below advertisementOK! can reveal Princess Diana is at the center of renewed debate over her mental health, with experts and royal insiders reassessing whether the late Princess of Wales may have lived with bipolar disorder, as fresh scrutiny is placed on accounts of her volatile moods and the strain they placed on her marriage.Diana, who died in 1997 at the age of 36 in a Paris car wreck, married the then-Prince Charles in July 1981, when she was 20 and he was 32.Article continues below advertisementSource: MEGAPrincess Diana died in 1997.