I'm 35 and have never really been in debt before I purchased my house a few years ago. Never have had a car payment. Never didn't pay off credit cards every month. I've just never been comfortable with spending money that I don't have.
I didn't go to college so that probably has something to do with it. Although, part of the reason I didn't go is because I knew I had no idea what I wanted to do and was afraid to go into debt to do it. I figured at some point I wanted to run my own business of some sort so college wasn't going to deter me from that.
Things have worked out. Who knows though? Maybe I would have been better off with heaps of debt and a degree.