Your "... unfalsifiable classification" question is a fair one, but your final paragraph conflates "opinions" with parent's "commitment" -- a false equivalence

Your "... unfalsifiable classification" question is a fair one, but your final paragraph conflates "opinions" with parent's "commitment" -- a false equivalence that amounts to a strawman argument. --- My own take is that it's less about a period of time [during which loosely-held opinions ostensibly ossify into the kind of commitment that interferes with honest pursuit of truth] and more about mindset, ego and circumstance. Which latter variables are difficult if not impossible to ascertain or verify. Which is why peer-reviewed science -- in removing as much subjectivity as humanly possible -- is our best and only plausible path to truly objective knowledge. (Which in turn is not the only kind of knowledge worth having or sharing! Far from it! But I digress.)