On time

At the risk of actually sounding like a grandmother, which I am, how can it be that life passes so quickly?
When we are children, we think that time is interminable. Christmas or the next birthday or even the weekend will never come. Events that occurred 100 years ago are certainly ancient history.
As I am creeping up on my 64th birthday, 100 years doesn't seem so long ago. The weeks roll along at a frantic pace. Certainly there are blocks of time that pass at agonizing snail speed...times when someone I love is sick, or I'm waiting for an important phone call. But, in general, the time from one Christmas to the next is definitely shorter than when I was a child. I guess, it's a matter of perspective.
I have wondered what it would be like to live outside of time. Humans are locked into straight line, one dimensional time....except in science fiction novels. No matter what it feels like, any change in the length of a day or a year is imperceptible to us.
I believe that God exists outside of time....that in the process of creating the world, He created time for man's benefit....He doesn't need it. I expect that when we die, we step outside of time and don't need it any longer either.