Age has not dulled Dr Mahathir Mohamad’s wit or sense of humour, as evident in a recent video where he jokingly searches for the billions he is alleged to have amassed.

The clip shows the former premier, who will turn 100 this year, looking for something in various places, including behind a TV.

Asked what he was looking for, Mahathir replied: “Duit, duit, duit (money). The RM3 billion that is...