...and then my id told my superego to shove it

You know, INFP's functions seem almost like an exaggeration of typical human development.

Fi in childhood - well, I mean, what child isn't prone to emotional overload? I think a lot of children are probably trying to figure out a moral framework by which to live as well.

Ne in late teens/young adulthood - This is the stage that developmentally, we are supposed to crave new experience anyway. It probably means, though, that a lot of INFPs have trouble with getting things in proper order in their lives at this time, and thus may have difficulty in college. However, I find that a lot of disciplines use a lot of Ne in theory, so it can also be helpful.

Si in middle adulthood - This is probably a time when INFPs would feel compelled to settle down in their life, and it is the appropriate time to settle in human development, isn't it? Isn't this age already reminiscing about the past?

Te in late adulthood - Isn't an elder supposed to have some kind of refined intellect? Te. I'm just saying.