There is a saying that if you arent Liberal in your 20's then you have no heart, and if you are conservative by the time you are thirty then you have no brain.
Men tend to gain social power as they age, and conservatism is about keeping the current social power structure. It's self-interest.
I know that there a lot of people who are over 30 and are liberal, but there is no doubt that a big chunk of the liberal base is under 30. It should tell you something about what liberalism is. Liberalism vs conservatism has lot of experience vs inexperience built into it.
Does the famed liberalism of the college professoriate also tell you anything about what liberalism vs. conservatism (more learned vs. less learned)? I'd guess you don't believe in that connection. It's not very convenient for you.