In my experience in a small leftwing party were the old-generation decided as a group to pass power over to the newer generation some years ago, the kids by themselves are just manipulated by more recent propaganda instead of old propaganda (for example, the new young leadership, having grown up under Neoliberalism, saw many elements of it as "natural" and hence part of the "structure we have to work within", rather than seeing those as just political choices like the rest) and end up fucking shit up in new ways (that party has pretty much collapsed to non-existence since) rather than being wiser than the older ones.

Beware of fetishising youth.

As I see it, you need a mix of all kind of people of all ages and all origins influencing politics, rather than just people with a very narrow range of life experiences. Also regular change is important - dishonest people using positions of power for their own ends, entrenched control of power and unchallenged groupthing becoming unquestionable dogma, are all things that get swept away by regular change.