Less idealistic and optimistic.
ALOT less, yes. Me too.
Also, as I got older, I found my beliefs turning away from liberalism and more conservitive. I'm now convinced that it's an age thing. I actually saw it happen to the adults in my life when I was growing up, but, naturally, being young, I didn't understand what I was seeing. But once it started happening to me, I understood it completely.
Alot of younger folks I meet make the mistake of thinking this means that I started out as a Democrat and am now a Republican. Not true. I've never had much faith in EITHER party, and I can't imagine that I ever will.