My 20 year high school reunion is just around the corner, and I've been thinking a lot about how much more I know now than I knew back then. When I was 17 I was pretty sure I knew everything. Now, at 37, all I can think about is how stupid I was at 17. Then again, when I'm 57, I'll probably think I was a moron at 37 too. Anyway ...

What if you could go back in time and talk to the younger you? Specifically, what advice would you give yourself when it comes to collecting? Are there any items you would tell yourself to hang on to? What would you tell yourself to sell, and when? Anything you would warn yourself about? What do you think the younger version of yourself would have a hard time believing?