World Not ‘enough in the tank’: New Zealand prime minister Jacinda Ardern quits over burnout January 19, 2023 Kim Hjelmgaard, USA TODAY Comments Off on Not ‘enough in the tank’: New Zealand prime minister Jacinda Ardern quits over burnout Jacinda Ardern has been in the role since 2017. She was elected aged 37, at that time the youngest female leader of any government in the world.