Wrinkles.

There are essentially four types of wrinkles.

1. Sun exposure wrinkles, so you look a little weather-beaten and slightly squinty.
   
2. Grumpy/frowny wrinkles, so you get the crease in between your eyebrows
3. Laughter wrinkles that make you look like an open and friendly person ALL the time
4. And lastly, the kind like what I'm probably going to end up with - the bewildered/surprised wrinkles.

I hope I get the laughter ones, but I'm not likely to. I am a natural born worrier, and my face has been plastered with a permanently bewildered look. It might have something with my eyebrows sitting a little higher than a normal person's. Or maybe that my eyes are so round. Or just that I'm so lost in my own thoughts, I forget to wear any other expression.

Expressions are really hard to master.