What is it about the opinion or viewpoint of a "young person" or "youth demographic" that inherently makes it "better" or more valuable than the opinion or viewpoint of an "old person" or "elder demographic", especially given the relative lack of life experience?
Kids are dependent super-impressionable idiots. Make them feel like they're both righteous and part of the <good guys>, and you have them on the hook for most likely much (if not most/all) of their lives thereafter..especially if you push to infantilize people well into their flippin' 20s.
The Jesuits (in their time/prime) were quite good at this, if you need an example.