Its hard working in a tech office where at least 30% of the folks who work around me were either not born, or too young to remember anything about that day.
and even the "kids" that are 29/30 today, they may vaguely remember that their parents were acting weird, that they got picked up early from school/pre-school, and that the TV was constantly on showing the towers falling over and over.... but they processed it differently in the almost quarter century.
to them it was something that happened to their parents (unless they were directly impacted). They remember that we were basically at war with the Middle East for the next 20 years, but not the impact of the day it happened
we were on a group call when someone mentioned it being Sept 11, and it went quiet for a tiny second, and one of the younger guys just immediately starts jumping in and asking tougher questions about the call topic, and the older guys on the call just had to kind of mentally move on quickly.
Im sure the greatest generation dealt with the same shit on Dec 7 1965.... the kids remembered the war, but not the day brought us in it