North Korean leader Kim Jong Un celebrated turning 40 on his presumed birthday. The secretive regime has never officially confirmed his birthdate, but the US government lists his birth year as 1984. Kim's presumed birthdate has consistently passed quietly without mention in the media or on the country's calendars. This year, Kim visited a chicken farm with his daughter and senior officials. South Korea's intelligence agency believes his daughter may be a likely successor. Kim's government is heavily sanctioned over the country's nuclear weapons program.