North Korean dictator Kim Jong Un believed to have turned 40

However, there could be numerous other explanations, he says, including believing "that idolising his ancestors and family is enough" and wanting to "promote his image as a humble leader".

Others suggest his age is the problem. Experts say that older members of North Korea's ruling elite feel he is still too young - although it is notable that his father's birthday became an official holiday the year he turned 40.