Hrmmm... well for me part of the appeal is being diapered and treated younger than I am 'supposed to be', despite already being little.
I guess I am comfortable acting emotionally around 7-8. That means I am almost always angelically good, and never ever for sure throw a tantrum or tell a fib.
I'm precocious though so mentally I enjoy kid appropriate activities targeted at 10-12 year olds! Like, I love Disney movies, an sum anime, or playing Pokemon cards n' stuff.
Despite that ... I get treated like a 2-3 year old who's not properly potty trained... *blush*