In maturity and academics, I have always felt like much ahead of most peers. However in terms of the ways that I perceive the world (not in terms of being innocent, as even at 9 I was quite pessimistic of the world and humanity; more in terms of how I interact with the sensory perceptions), then I still feel as I did when 5.
When trick-or-treating at age 15, I was told I sounded like a kindergartener. Something about the way I talked and walked about, I guess. I tend to have a bit more bounce in my step than many people my age, and in my movements in general I feel quite young.
Also my rebellion stages seemed to not really kick in until a bit later than for my sisters. It's almost like my mind is too busy trying to juggle everything in my life, that I don't have time to do some other things (much like how doing schoolwork meant that I couldn't learn laundry or dishes, though unfortunately my older sisters got jealous that I didn't have to do the chores, when I didn't know how to do them - they didn't understand though, that even though they'd learned when younger than me, that I wasn't quite able to do it yet).
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"There are things you need not know of, though you live and die in vain,
There are souls more sick of pleasure than you are sick of pain"
--G. K. Chesterton, The Aristocrat