In some ways, I’ve always been far more mature than many NTs ever are, and in others I’ve never really developed at all. In general, though, I estimate my non-physical age to be around 10. Never really had any of the non-physical changes associated with puberty (which I think is why the two real friends I had in elementary school suddenly began rejecting me around then, they sort of “outgrew” me). Still very dependent on my parents, despite all my efforts to change that over the past decade or so, and learning to accept the fact that that probably isn’t going to change anytime soon, if ever. And I was a weird kid who would read the dictionary and insect field guides for fun and regularly complained about never having had a nightmare of the “traditional” sort, I haven’t really changed in manner of interests, either, only in exposure to things 
_________________
Yet in my new wildness and freedom I almost welcome the bitterness of alienage. For although nepenthe has calmed me, I know always that I am an outsider; a stranger in this century and among those who are still men.
-H. P. Lovecraft, "The Outsider"