FRE0 saidAlso, loss in height will reduce the size of the chest cavity thereby reducing lung volume. Skeleton stiffness can reduce usable lung volume.
I thought, perhaps incorrectly, that loss of height as we get older could be reduced or even eliminated by regular walking and/or running. That our bones need that regular impact of our feet hitting the ground.
I haven't seen him in the last year or so but there used to be a guy who ran in my neighborhood, before I started running, and he was well into his 70s if not his 80s. I could easily walk faster than he ran, which was almost a shuffle. I hope to be like him, running, shuffling, or whatever, up to the very end.
It may be that the loss of body height can be reduced, but I doubt that it can be eliminated. In my case, my spine looks horrible in an x-ray; the pads seem to be missing. However, as long as I do stretching exercises, there is rarely any pain.
As to running, considering that I can barely jump it's not surprising that I really can't run. Even so, I still walk considerably faster than most people and can still hike long distances. Hills do slow me down though because then my respirator limitations become apparent.
A couple years ago, after going to San Diego by motorcycle (about 850 miles one way), I went to Blacks Beach, a well-known nude beach. To get there it is necessary to climb down very rough stairs on a cliff that is about 350 feet high. Climbing up was a bit slow but no real problem. Here is a video of the stairs and trail:https://www.youtube.com/watch?v=7reCm1pcNso
In the gym, I do crunches on an inclined plane while holding a 35 pound weight against my chest. That's better than most guys of any age can do.
It is very annoying to be treated as feeble, helpless, and incompetent. In a doctor's office, I was supine on an examining table when the doctor offered to help me up. I sat up quickly before he was able to help. When I had a blood test at a laboratory, the personnel seemed amazed that I had ridden my bicycle a whole 2 miles to get there. Of course I can quite easily ride more than 30 miles. Some people seem amazed that I can still ride long distances on a motorcycle. Only a few years ago I took a trip from here in Albuquerque to Savannah, Georgia, a round-trip distance of 5,500 miles.
Years ago, when my mother applied for Social Security, the clerk asked her, "Do you think you know where you were born? Do you think you know where you went to school?" Mother understandably became very angry and said, "What is this 'Do you think stuff?' Do you think that I'm completely incompetent?'" That sort of thing is entirely too common.