Finland's Minister of Transport and Communications Sanna Marin will swear in as Prime Minister Tuesday, to become the world's youngest politician to serve in the top post. She was elected Leader of the Social Democratic Party after Prime Minister Antti Rinne resigned last week after losing the confidence of the Center party, a coalition partner, over his handling of a postal strike. Marin will lead a five-party center-left coalition, the leaders of which are women. She will be the Nordic country's third female prime minister. New Zealand's Jacinda Ardern, 39, and Ukraine's Oleksiy Honcharuk, 35, are the other woman Prime Ministers of the world in their thirties. "I have never thought about my age or gender, I think of the reasons I got into politics and those things for which we have won the trust of the electorate," she told reporters. Being the largest party in the coalition, the Social Democrats have the right to appoint the prime minister. However, the party's popularity is currently low at just 13 percent. The coalition government is working on a common policy program it announced in June. According to Finnish broadcaster YLE, Sanne Marin was raised by a single mother who currently has a same-sex partner. She was the first university graduate of her family. A Master of Administrative Sciences, Marin began her political career in 2012, getting elected to the City Council of Tampere. She was first elected to the Finnish Parliament in 2014, and was re-elected in the elections held in April this year.