By Paul Casciato LONDON (Reuters) – Hollywood star Angelina Jolie has had a double mastectomy to reduce her chances of getting breast cancer and says she hopes her story will inspire other women fighting the life-threatening disease. Jolie wrote in the New York Times on Tuesday the operation had made it easier for her to reassure her six children that she will not die young from cancer, like her own mother did at 56. "We often speak of 'Mommy's mommy', and I find myself trying to explain the illness that took her away from us. They have asked if the same could happen to me," wrote Jolie, 37. …