Former President Jimmy Carter (90 years old) announced he has been diagnosed with cancer. Cancer is widespread, but not yet clear what kind of cancer he has. It was discovered after a procedure on his liver earlier this month. Carter announced on Aug. 3 that he had surgery to remove a small mass from his liver. "Recent liver surgery revealed that I have cancer that now is in other parts of my body," Carter said in the statement released by the Carter Center. "I will be rearranging my schedule as necessary so I can undergo treatment by physicians at Emory Healthcare."