Survivorship bias may encompass several subtly different cases. I didn't make an analogy, I provided an example. How do you know the advice to walk from the ol

Survivorship bias may encompass several subtly different cases. I didn't make an analogy, I provided an example. How do you know the advice to walk from the old person is correct? Because we have studies that conclude walking everyday is good for the health and using the bones actually strengthens them (probably with caveats, where specific people in specific situations should actually not do this for some reasons), etc. You don't know from n=1.