Time Flies

 So why is it that grandkids grow up so much faster than your own kids?

Because you're older, and 5 years of kiddo-growth is a proportionately smaller part of your life when you're 50 than when you're 25?

Or because your whole life isn't consumed with tending them, caring for their every need, comforting, teaching, feeding, cleaning, knowing their lingo and their own sinful propensities and their own particular sweetnesses?