Suppose that at a distance you see a short, stooped figure walking with short, slow steps. Most likely, you will conclude that the person is old. The hunched posture gives you the clue.
Why does aging contort so many bodies in this way? The reason is that many people, throughout their lives, never extend the neck to its full range, and so the muscles shorten. Long hours of reading, sewing, typing, or standing at a workbench take their toll. Eventually deposits of calcium salts in the joints complete the process of immobilization. Once this calcification takes place, nothing can be done to reverse it. Read more