View gallery Image Credit: Yui Mok - WPA Pool/Getty Images King Charles III remains in generally good health at 76, though in early 2024 the monarch revealed that he had been diagnosed with a "form of cancer" following surgery. The diagnosis reportedly "shocked" multiple insiders from Buckingham Palace, according to People. "I was really shocked when I heard it," the source told the publication in February 2024, before adding, "He has not looked himself. I put it down to grief - he'd had two deaths close together - but maybe he wasn't well, without realizing so. It would take it out of him.