At some point in your late childhood, you are relieved to find that hours, rather than dragging on seemingly forever, have begun to fly by.
By the time you reach early adulthood, you’re a bit taken aback to realize that days are now flying by.
Then you wake up one day in middle age to realize that weeks and months now seem to disappear in an instant.
The velocity at which the life-trajectory is completed is not a constant, but rather increases exponentially.
This is conventional wisdom, of course. But it bears restating.