We had a relatively same situation on our trip last week. We went for my DD 16th birthday celebration. She wanted to go to MK and BBB and dress up as Tinkerbell. Long story short, after BBB, a full tink costume w/wings, and a tinkerbell facepaiting from toontown, every younger girl who passed her mistaked her for tinkerbell. She had her picture taken with many kids, and some even wanted her autograph. Many mothers as well commented on how they appreciated older kids dressing up. It didn't bother me when they took her picture as they asked for it and there was a legitimate reason for taking one. Something that bothered my daughter was when she was in the gift shop of PhilharMagic alone and an older guy CM started chatting with her (he was from NJ as well). He took her picture on his phone and then she left and came to me. So all in all it wasn't as creepy as some experiences that have been described but you still have to be super careful, even in the most magical place on earth.