My Husband and I were talking last night about what type our 7 year old daughter is. We know she's extroverted and I'd say even at the age of 7 she seems J, but the rest is baffling.
One thing I think may be relevant is that she loves strategy games and is currently playing Shadow of the Colossus (NT husband loves this game as well) which I find to be tedious and boring. Another one of her favorite games is Command and Conquer which is all about strategy.
She's also very well behaved and trustworthy. She also keeps a close watch on the other kids and reports any and all wrong doing back to me. One of the reasons I though she was an ESFJ but then the video game thing has thrown us off.