Titillating post. As a musician, time is of the utmost importance and the nuances change the rhythmic structure and "feel" as one performs it.
A kinda silly answer comes to mind:
Mathematically when you are 10 years old a year is 1/10th of your life, a large percentage.
At say, 50 years a year is 1/50th, a way smaller percentage. Thus time seems to speed up. Humor as remedy? : )