Tipsheet Kim Jong Il's Youngest Son Named Successor Greg Hengler | June 02, 2009 11:38 AM Kim Jong Il's oldest son, Kim Jong-nam, was out of the running after his 2001 attempt to enter Tokyo's Disneyland failed; he was arrested for travelling on a false Dominican passport. Lucky for him. Kim Jong Un is only 26, but could soon be sitting in his father's seat.