Halfway to 45

At the Tavern tonight, I realized that, as of today (or yesterday, technically, as it's past twelve), I have been 22 for six months. Halfway to 45. Halfway to old.

It's really been a blur, the last six months. Nothing has happened, nothing has changed. My life has droned on for six months without me realizing it.

My big worry is that I'll feel the same way when I really am old. When I'm 45 (or 50, or 80), will I feel the same way I do now? That the last 22 (or 27, or 57) years have passed me by, and I didn't even notice? Will anything that I do have been worth doing? What if someday I realize that I've squandered my entire short existence? How can a person prevent that?