Finland's Sanna Marin is the world's youngest Prime Minister at age of 34. Sanna will succeed Antti Rinne after he resigned as PM of Finland. Sanna will lead a centre-left coalition with four other parties, all headed by women, three of them are under 35. After taking oath, Sanna Marin will be the third female Prime Minister in the Nordic country. Sanna Marin was the transport minister of Finland since June. She became the MP at the age of 27.