Summer is Ending

I sit here and whine about how quickly the kids are growing and changing - I am sure that all three of them would be rolling their eyes and complaining if they knew I was typing this (well, not Elle as she is proud to be getting older). I am not sure where the summer went either as it was gone in the blink of an eye this time. Does time's momentum start speeding up as we age? I can remember summer seeming to drag on FOREVER. All the hours in the sun (which I regret now), reading good books, listening to music, doing mostly nothing. Now, if I sit down for just a second, suddenly, thirty minutes or an hour has passed in what feels like an instant. Is that a sign of getting old??