Everyone's height decreases with age.
The padded disks between the bony vertebrae shrink as we get older.
Your face on the other hand tends to keep growing and widening.
Your eyes don't focus as well either after 40.
The warranty on our bodies seem to expire at 40, and then problems develop more and more every year.
In 2008 I had to have 2 surgeries in one year. First time ever in an operating room. Really scared me the first time. Second time was a piece of cake since I was used to it by then.
We all wear out.