Kids saying their time flies is an example of what I'm trying to say. They cant understand how we feel as adults because they havent reached that point. They probably dont remember their years before certain age but I sure do and I remember my days being so long. It used to be eternal mornings, long ass rides to school, eternal school hours that never ended, lunch lasted for ever, after school was forever and nigh-time also seemed to last forever. Now I just wake up and find myself going back to sleep in what seems to be a couple of hours. I could have never explained this back then.