96-year-old Former President of the United States of America, Jimmy Carter and wife, Rosalynn are celebrating their 75th wedding anniversary on July 7. The couple has the enviable record of being the longest-married presidential couple in American history. Speaking to AFP, Jimmy Carter attributes one of the secrets of a long marriage to picking the right partner. The former US President hails his marriage to 93-year-old Rosalynn Carter, describing it as a full partnership.