Finland anoints Sanna Marin, 34, as world's youngest serving prime minister

Former transport minister is country's youngest leader ever and third female PM

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Finland will have the world's youngest serving prime minister later this week when Sanna Marin, 34, is sworn in by parliament at the head of a coalition whose four other parties are all led by women, three of them in their thirties.

Marin, currently the transport minister, will take over from Antti Rinne, a former trade unionist who resigned last week after just six months in office when he lost the confidence of the Centre party, a coalition partner, over his handling of a postal strike.