The waning of metaphysics?

Is metaphysical speculation, like sex, a young man's game?  10 years ago if I had posted reflections on a long drive from north to south, they would likely have been filled with more deep thoughts. Today, I am more empirical in orientation. Is it simply from a lack of energy for speculation, or am I intrinsically less likely to speculate?

The fact that I am asking these questions now suggests a couple of things:

1. I ain't dead yet
2. The morning is a better time to think expansively than late at night, when I am tired from a day of driving.

Maybe I am just a repressed morning person.

Or perhaps, as Chad McCracken put it in his poem many years ago about Bear Bryant, "heaven is where the ground is."