I was thinking about E_TJs and their fourth function (Fi) and was wondering about this.
The occurance of a 'midlife crisis' seems to be quite common in the Te doms, the high performing and very driven business types. I was wondering if a midlife crisis could be an 'awakening' of inferior Fi? "Who am I? What actually matters to me? What is really important?".
I see it as a possible last step to self-fulfilment for the E_TJ.
This could possibly apply to the other types as well:
ES_P: Ni = fear of approaching death/old age
I_TJ: Ne = trying to find meaning in their life
EN_P: Si = regret over past mistakes/missed opportunities
IN_J: Se = "check out my new porsche!"
I_TP: Fe = Loneliness, search for connections
E_FJ: Ti = Breaking down long held beliefs
I_FP: Te = "Have I made any difference to the world, have I achieved anything?"
Just a thought