11. Sebastian Kurz - Austria
Sebastian Kurz, only at the age of 30, was selected as chancellor of Austria twice from 2017 - 2019 and again from 2020 - 2021. Just at 24 in 2011, he acquired his first government mandate as state secretary, accountable for socially integrating refugees.
During his first chancellorship, Kurz was credited with mostly following through on his campaign pledges, but his leadership technique was widely criticized as not cooperative and impulsive.
Kurz was the youngest chancellor in Austrian history and the youngest head of government in the world for about four years.