My nephew's also 4 and he loves Star Wars. I was talking to him on the phone Saturday, and he said to me, "I don't think I can come over tomorrow Uncle Matt." I kind of knew that since he lives in NY and I'm currently stationed in Wyoming/Colorado.
I told him it was too bad because I had all my Star Wars toys out and we could play all day with them, he immediately called for his dad saying, "Dad! Uncle Matt has Star Wars toys and we could play ALL DAY!"
He's probably still bugging his parents to come for a visit.