Seems like that kid struck a nerve with you 😅
Maybe in Finland it's generational. Here it seems cultural. I rarely see people who are able to manage their money really good, most just survive. Thinking ahead and planning is not common at all, at no age, at least here. Neither is problem solving. Improvisation, yes, but really fixing the problem? Forget it.
Those who do, are incredibly successful. It's actually much easier than it looks to create a profitable business here - if you're able to plan ahead and invest your money somewhat wisely, you're already 20 steps ahead of the competition.
Looking at the debt problem (which is a part of spending), I don't think it's generational. Even my father is still paying off debt because he was never smart with money, and never learned. Luckily, we had my mother, so here we are.
The situation might be getting worse, I agree - but the resistance against learning and getting your life together is not exclusive to gen Z at all.