For myself, I find I'm stuck at different ages, depending on the
   context. I suspect it's similarly true for most people, if not
   all.

   I'm thinking primarily of emotional responses.

   For example, I have an analytical curiosity that has an excited
   "I'm going to figure this out if it kills me" component to it
   that's very strong.

   I know for sure I've had that since I was 11 yrs old, so
   emotionally, when it comes to "figuring things out", I'm 11 yrs
   old... just with lots of new knowledge thrown in the mix.

   Humor wise? A very mature 9 years old. There's a fart? I laugh.
   Wait, that makes it about 6 years old, because I find puns and
   clever word play hysterical. "I see what you did there".

   But I instantly turn into a 43 year old Dad/Uncle/Grandpa role
   (I'm only Uncle but they all apply) when someone is trying to
   figure out a life-problem.

   [and occasionally, I turn into an 84 year old who is glad about
   this trip around planet Earth and go, "Yup, it was a life well
   lived"... strange because I'm not there yet, but if I practice
   that attitude enough, by the time I get there (if I do), I'll be
   'that guy' ]