I was thinking of making an RPG for my young cousin who just turned 4. His interests right now primarily revolve around firefighters and firetrucks, and I was thinking of designing a very simple RPG based on this. Then I got around to thinking that he cannot read, yet. Once he learns to read, what other skills are needed to play an RPG of the simplest kind and at what age are such skills acquired? Anyone responding to this thread is also free to suggest ideas to incorporate into such an RPG!