Really interesting thread on the 'abstraction ceiling' people supposedly hit with maths, essentially a nature versus nurture debate, but speaks very much to my own experience as someone who initially went to university to study 'pure maths'....and is now a sociologist.
Douglas Hofstadter wrote about his experience of running up against an “abstraction ceiling” in his own brain while pursuing a PhD in mathematics.
As Hofstadter describes, the abstraction ceiling is not a “hard” threshold, a level at which one is suddenly incapable of learning math, but rather a “soft” threshold, a level at which the amount of time and effort required to learn math begins to skyrocket until learning more advanced math is effectively no longer a productive use of one’s time. That level is different for everyone.
For Hofstadter, it was graduate-level math; for another randomly selected person, it might be earlier or later (but almost certainly earlier).