Do people tend to become more conservative as they age? If so, why?

It seems like there are a lot of people who start off liberal as youths, and then turn into right wingers when they get older. It’s an annoying trend, to me, and yet, I find it in myself, too. I mean, I wouldn’t call myself a socialist any more. Just a liberal. I’m also not a big supporter of using price controls as a mechanism to fight excess profits any more.

What do you think? How have your political/social views changed as you have aged?