It feels faster because the brain has less memory capacity so it takes things out. If you remembered every second life would seem way too long. If we had some way to enhance the memory that'd be sick but sadly we do not. The only way to make life seem long is to have a life that is filled with sick memories haha
Time is relative. If you are really enjoying yourself it flies by far faster than you wish but if you are not a happy camper an hour can be forever. I do think in general that time seems to go faster now that I am aging.......funny as I remember my mother saying it would when I was younger and seemed to know more.
I stick to the pure fractal mathematics. to a 4 year old, 1 year is 1/4th of life to a 40 year old, 10 years is 1/4th of life.