I grew up hearing my Dad say this. Well, maybe he only started to say it when I was in my mid-twenties, but much of what my Dad says sticks with me. Some of it I come to realize later on. This is a later on realization.
My youngest son turned 3 yesterday. After his little party and the kids were in bed, I headed back into the office to attack some of the work that I have to do, but just don't have time in the "work day" to do. I came home to a sleeping family and did the fatherly kiss them good-night again rounds, and while starring at my sons in their bunk beds, I heard my Dad's voice ringing in my ears. "Life comes at you fast".
Think about that for a while, you'll be a better person for doing it.