WE ALL DO IT, YOU know. Distract ourselves from noticing how time's passing. We throw ourselves into our jobs. We focus on keeping the blight off our tomato plants. We fill up our gas tanks and top off our Metro cards and do the grocery shopping so that the weeks look the same on the surface. And then one day, you turn around, and your baby is a man. One day, you look in the mirror, and see gray hair. One day, you realize there is less of your life left than what you've already lived. And you think, How did this happen so fast? It was only yesterday when I was having my first legal drink, when I was diapering him, when I was young. When this realization hits, you start doing the math. How much time do I have left? How much can I fit into that small space? Some of us let this realization guide us, I guess. We book trips to Tibet, we learn how to sculpt, we skydive. We try to pretend it's not almost over. But some of us just fill up our gas tanks and top off our Metro cards and do the grocery shopping, because if you only see the path that's right ahead of you, you don't obsess over when the cliff might drop off. Some of us never learn. And some of us learn earlier than others. --