On the perceived speed of time over time

“I don\´t believe it: another year has flown by-it seems that time is going by at an ever-faster rate."” This often expressed perception of time, the speed of time, is both qualitatively and quantitatively explored. While the speed of time is clearly invariant (at least on earth and at traveling speeds that are orders of magnitude below the speed of light), there is ample and plausible evidence that serves to contribute to our perception of a faster moving time. More specifically, it seems that both nature and nurture impact or influence our perception of time and the speed of time. In this exploratory study, we have briefly reviewed the cognition and related literature to understand why the older we get, the more we perceive the speed of time to increase - there is a clinical reason for this aging phenomenon. We then showed that environmental or experiential factors can also effect our perceived speed of time. Indeed, although the results should be considered preliminary, our analysis suggests that the nurture-related experience may have a stronger impact on our perceived speed of time than the nature-related perception (i.e., due to aging)