I'm 44 now and I know there is NO way I'm hitting 88. Which is fine.
But I remember a coworker once telling me when I was in my mid 20s that "The day will come when you realize you have more days behind you than ahead of you."
That said it's been on my mind more (not in a depressing way, just a thoughtful way) that I have reached that point.
Granted, I've always assumed either bad luck or injury would take me out, but now I'm at the point that even if I wanted to live forever, I'm way past halftime.
Have you noticed any changes in your goals? Hopes? Mental state?