I’m not a Finn. But I travelled that miraculous northern country for more than 10 times now. I’ve been to the Cities of Helsinki, Pori, Kuopio, Tampere, Turku, Rahe, Lahti, Jyväskylä and certainly a couple others I do not remember right now.
But in all my travels I have always met, politically active, motivated, bright and hard-working youth. They were all members of youth a youth councils or former members. Some even got involved in the umbrella organization of youth councils in Finnland, nuva ry.
As a foreigner I will not tell anyone how and what to vote, but I ask you to consider that people being involved in youth council work, have a lot of competencies that will help them with their further political work. Such as the ability to speak, insight into political matters, know-how on how to work with a public administration, endurance and many others.
Most likely they will have more knowledge and political skills then many adults. Also the inexperience argument can not be held against them.