Disagree about the age threshold on epistemology. Being introduced to Hume in my teenage years is what got me to repeatedly revisit and reconsider old ideas, and look for new ones in much the way you describe. Human mental life & development isn't so simple as arbitrary age boundaries and specific, fixed learning environments.

Rather than selective pragmatic bias, maybe better is the ability to consider multiple viewpoints with multiple degrees of skepticism and evaluate the strong and weak points, benefits and negative consequences of a thing in tandem.

This is sort of the grander point & motivation behind essays like The Order Of Things -- it's being able to acknowledge how much of what we know & can know is determined for us, and to see the uncertainty of many parts of our existence headon, and see that as something that sets you free and puts the onus on you without defensive denialism or diving straight into flimsy pseudo-certainty.

It's no surprise that when philosophers started publishing books like that, they were accused by more conservative contemporaries of trying to undermine all of civilisation and dive into nihilism. It must have been unnerving to be confronted with the possibility that one's deeply-held convictions might not be eternally robust & not tied to any culture or time period, and seeing the only alternative as nihilistic would come naturally to such people over seeing it as something to celebrate and explore.