It's something I've always been interested in, but that's not surprising considering my background. No one is immortal, and life can throw curveballs, but doing what I can to be fit and healthy (while still enjoying life, I'm no carb-phobic zealot) just tweaks a few percent of odds of longer life, and more importantly an enjoyable life in my favour.
The reality is that for umpteen reasons, genetic, random, lifestyle, the majority of the adult population isn't that healthy. We're less likely to die in childbirth/ accidents/ random illness before all the other stuff catches up with us. Read classic literature and people were described as "sickly" probably often due to things like autoimmune conditions that we still don't know enough about. I hope that the interest in Long Covid does result in improved understanding of a broader range of chronic conditions.