- Is it because we have more to do and more obligations?
- Is it because a day represented a smaller and smaller fraction of a lifespan? And so they become less meaningful? Today is 1/680 of my niece's life. But it is less than 1/10000 of mine.
- Do we become less cognizant of the passage of time? I.e., I think the weekend will be here soon, my nephew thinks the weekend is so far away. (Then again, he has his TV privileges revoked until then, so that might have something to do with it. But I've so much going on, I'm lucky if I turn on the TV.) Ultimately, I would think adults ought to be more cognizant of time with the bazillion deadlines and due dates we have.
- Do our lives develop more rigorous patterns? Do our lives get more monotonous?
Any other ideas? I tend to lean toward #2.