A need for maturity
I want to start with an apology to all 18- to 25-year-olds who are mature and responsible and to acknowledge that I do not believe everyone over 25 is mature or responsible. In light of what we are seeing and hearing in regard to St. Patrick's Day celebrants and spring break students, it is obvious that there is a somewhat large group that doesn't have the maturity to be a responsible voter, though it is possible they don't even bother to vote anyway.
Until you have lived on your own and had to pay your own way in life, it is quite possible you haven't experienced life as a self-sustaining individual. Maturity comes with living, and I am aware age alone does not determine that. But I also believe liberal college professors can and do influence the thinking of their students and while they SHOULD be teaching them how to think and not what to think, that isn't always the case.