Why does time speed up as we age?

Well, age does and doesn’t matter I suppose. Really it goes 1,2,3…19,20,21, 30, 40, etc. 20 Somethings are, in fact, treated differently from 30 Somethings.

I would say another reason time seems to speed up as you get older is that a large part of your day is spent busy at work. Young people tend to have a lot more idle time and that tends to make the days drag a bit.