Answer
38 years old. John F. Kennedy Jr., the son of former U.S. President John F. Kennedy and Jacqueline Kennedy Onassis, tragically died in a plane crash on July 16, 1999, at the age of 38. The accident occurred off the coast of Martha's Vineyard, Massachusetts, while Kennedy was piloting a Piper Saratoga light aircraft carrying his wife, Carolyn Bessette-Kennedy, and her sister, Lauren Bessette.