@Bluedoc Thank you. Now I know more than what I did when I woke up this morning.
I am 72,and old age brings less strength and the diminished ability to recover. At times I have discovered myself slouching over. But because of my athletic past and military training, I self-correct, tell myself to stand straight and hold my head up. The point is, check your posture, keep your head up and maintain a healthy posture.