I stopped reading when I got to the line that said they tested people from 18 to 100. I wonder how much exercise the 100 year olds got? I wonder if the 100 year olds could even roll over in bed. I think the more exercise you get the sooner your joints wear out and you have to get new ones.
I didn’t get my skeletal problems from sitting on the couch.
Mine seem to have. Use or lose it also applies to bones and muscles.
You need SOME exercise.
Most of them can. My hundred year old grandma was still walking a mile a day. Her medicine was an occasional aspirin.
When you reach a certain age only those who are in decent health reach it so those people are usually still mobile.