The first person in her family to go to university, Marin graduated from Prikkala High School in 2004 and went on to study Administrative Sciences at the University of Tampere.
The former prime minister of Finland Antti Rinne resigned last Tuesday after intense criticisms over the way he handled a postal strike.
She will take power amid a strike by several of the country's largest companies, Reuters said. The strike is estimated to result in a loss of about 500 million euros ($550 million), according to the Confederation of Finnish Industries.
Source: Reuters
"We have a lot of work ahead to rebuild trust," Marin told reporters after she won the premiership.
"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 continued.
Source: Business Insider
Her achievement is no mean feat when you compare her age to other world leaders —Donald Trump was 70 when he became US president and Britain has not had a prime minister under 40 since 1806.
Marin joins other young world leaders, including 39-year-old Jacinda Ardern, New Zealand's prime minister, and 35-year-old Oleksiy Honcharuk, the prime minister of Ukraine.
Marin's age and progressive politics, along with the fact that she is a new mom, have garnered comparisons to Arden.
Source: BBC