Probably around 8-9? At least looking back. It's hard to remember but I played soccer then and I was awesome at it (because I wasn't the smallest and weakest on the team yet) and I had some fun times with teammates. I got to have a short haircut which I liked a lot better than my shoulder length hair. I still went to summer camp which was fun, although it was maybe better around 7-8. (By 9-11 things change. Kids start telling you that you can't have friends of the opposite sex without liking them romantically and stuff and I never coped well with that.) I was the near perfect daughter, student, etc. I was quiet but people were willing to let that slide, back then.
"How could you tell if your instincts were just hope in disguise, and if your hope was really desperation parading as possibility?" ~Laini Taylor