I'd like an opinion from Delph on this.
It's a question that we discussed here in quite a lot of detail. There's no good answer for it - the youth aren't behind PiS in any number, and the only politically active youth are blindly supporting Kukiz/Korwin, but the numbers are still tiny compared to the total youth electorate. There's a whole lost generation here, and I don't have any clever answer.
My own theory is that there's something with the educational system that is alienating the youth voters. While the schooling system from 3-16 is fine, there's something broken in high schools and universities that leads to a huge amount of apathy. Look at the student self governments here in universities - they're absolutely spineless and toothless compared to their French, German or British peers. But it goes from the beginning - I've done some research into student self governments in schools, and it's quite remarkable how teachers shape and mould them in their own personal vision as opposed to letting them be genuinely independent.
It's also worth pointing out that schools have very little in the way of current affairs education - kids simply don't have much of a forum to learn about these things, so they tend to take their views from their parents. If their parents are alienated, it's likely that the kids are too. In my own workplace, there was almost no attention paid to the election by the kids - it was only after the election that they started to realise that they might be stuck in primary school for 8 years and not 6.
PiS won't change things - in fact, pushing more "Polishness" and history onto the youth might make them even less interested. I know from the kids in school - the average 11/12 year old simply couldn't care less about any fuzzy notion of patriotism. They listen to music from all over the world, they don't think of "us" and "them" in the way that a PiS voter might - they have a completely different view that politicians simply don't understand.
If you ask me, the biggest problem KOD has is with the youth. Getting the 30+ generation out is easy - getting the 18-30 generation on the streets is much, much harder - and yet vital.