Is this pointing to the same idea behind "the chains of habit are too light to be felt until they are too heavy to be broken"? I concede I may not be as quick to learn as I was when I was in my late teens/early 20s, but I hope that I'll still be able to learn new things and able to recognize the error in my judgement well into my old age - despite having been a classically high performer in school (although grad school did pummel me down).