"...if one walks briskly it tends to subtract 20 years from biological age. It also mentions that long-term studies show that those same people tend to live to 85 (men) or 86 (women)."
I'm confused. Are they implying men would live to 105 and woman to 106 if they slowed down?
Before my spine turned at least 105 about a year and 1/2 ago, I was a brisk walker. Put simply, I was a brisk walker before I needed a walker. But the briskness of my walk didn't cause my need for a walker.
Anyway, until recently, I walked briskly, and also tall-y; chin-up, shoulders back, straight-spined.
Now,
most of the time when I walk, my spine looks like the letter C, I lead with my noggin, and hope for the best. And because that posture comes with limited visibility, I move slowly and cautiously.
I do have better days, though. Like when my yoga exercises hit just the right way, I slept in just the right position, or I'm in a really good head-space.