Anna I took piano lessons for a few years and I always wanted to learn very difficult stuff.  So my mom gave me the piano she had for us when I moved out.  sadly it is in the basement (in bad need of a tune) and while i still remember how to play it's hard to get motivated to focus on something like that once real life kicks in.

That's why I think learning the skill as a kid is very important, b/c then you are more likely to grow up and still play!