From what I've heard of HyperCard and learning programming languages, children definitely could create a small game, short animation or interactive story. At nine years old, it would probably be rudimentary, but they could learn the basics. Without meaning to be rude, this question's like asking "What would you expect a nine year old to accomplish regarding writing and drawing?"
If you don't like that analogy, consider how children often learn the basics of woodworking or sewing through small projects that might not be useful or even be completed. Programming could work the same way.