Of course young voters are less informed.
Also less experienced, less knowledgable, and less likely to see the bigger pictures in life. Hell, we all were like that. I voted for McGovern, for cripes' sake.
If there is one person here forty or older who thinks they were just as smart at 18 as they are now, they are lying in their teeth.
Politicians want voters who don't think, run on emotions, and have little in the way of fixed principles. The ideal voter can be toggled back and forth almost at will.