Are You the Same Person You Always Were?

A friend asked whether I think I'm smarter now than I was when I was 9 years old. Obviously, I am more knowledgeable, I have more experience (I have been vetted, just kidding). But really I don't think I'm that different. I still have the same issues. I still get pissed about the same things. When I think back on what I've done (or what I wish I hadn't done), I can totally relate to why I did what I did at the time. I'd like to think that I'm different, that I've grown and become the person I want to be, but I don't think I have. Do we really change?