If type is inherent and can't be changed, which seems to be the current mode of thinking, (though strengthening of weaker functions is always possible) then at what point do we gain our type?
Conception? In the womb? Is it genetic? Are there sperm with strong Ti and Ne fighting off other sperm with strong Te and Si? Are there some pairings of parents that are more likely to have one type of child over another? Do the functions we "choose" to form strongly not arrive until we start to form self awareness at around age two or three?
And at what stage in our evolution did this happen? Homo Sapien? Erectus? Was it when we were still chimps or even tree shrews? Can we then type animals? Or would some animals have a different number of functions? Maybe just Si, Se, Ti, Te?
Do we even have the right number of types? Maybe there is eight funtions, but maybe there's fifty-six types? Or even forty thousand three hundred and twenty types?
Have these questions already been asked and answered? I'm curious.