My realization is that I am about in the middle of my life. That means half of it has already passed. There's only half left, and that includes old age. It makes me think deeper about how I am living my life.
Yes, you've summarised my everyday thoughts rather well. This is something that is pretty predominant lately in my mind, and also the fact that my own parents' mortality is an impending one from this point onwards. These two thoughts combined, have become sufficient to make so many other things appear trivial by comparison (and thank God for that).
