I'm planning to get my kids into robotics in the next year or so.
I'm not sure how interested my daughter will be, but I think my three year old son will really get into it. He's close to being able to read, and draws/paints pictures plus plays music at probably a second grade level-- so I think he's smart enough to learn some very basic programming.
It would also be a smart career move for me. Additionally, I think it could be a major skill set for my kids as time passes further into the current century, if they take to it.