Also, it's a lot easier to pick things up again as an adult when you did them as a child. Take me for example - I quit Tae Kwon Do when I was 10 or 11, and I found myself remembering all sorts of fun stuff during the 2 classes I could handle this Sept. before my knee made me quit again.

When you learn things really young, your body remembers them in ways you don't even realize. The habit sticks, even if the skills don't, so when you try it again you have a base to work from that true beginners don't.

Then again, that might not be true for everyone, or for all skills.