The world's youngest leaders hail from across the globe — from democracies, monarchies, and dictatorships in Eastern and Western Europe, Asia, and the Middle East.
While seven of the eight leaders are men, the youngest — Vanessa D'Ambrosio, the 28-year-old captain regent of San Marino — is a woman.
Meet the world's eight heads of state under 40:
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8. Volodymyr Groysman, 39, is Ukraine's youngest ever prime minister. He was elected by Parliament in April 2016 and is a close ally of the president, Petro Poroshenko, who took power in 2014 following the ousting of the Russian-backed authoritarian Viktor Yanukovych.
7. Jüri Ratas, 38, is the new prime minister of Estonia (he was voted into office in November 2016) and the leader of the country's Centre Party.
6. Saleh Ali al-Sammad, 38, is the leader of the Houthi militants, who control much of Yemen, including the capital, Sanaa. (The US is providing support to the Saudi-led coalition fighting the Houthis, and Yemen also has a separate provisional government with a president and prime minister.)
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