Wartime

The paradox that’s confusing about age and time still continuing to pass later as an adult may probably lie in being physically grown up yourself and therefore the mind subconsciously assumes a general state of preservation and stagnation about the world from then on.
But, when being confronted with children, teens and young adults, for which physical and mental development - and through that: change - noticeably takes place, the brain of an already physically grown-up person is consciously being reminded that things ain’t so. That time still passes, growing older still is in effect and that major, not small, changes still happen.