Why has LC only seemingly only affected a certain percentage of people? Why do we share such similar symptoms?

I’ve been on and off this sub for over a year now. I had a different account before. I’ve read posts into the thousands describing the exact same symptoms I have. I mean so similar I could have written the post. Why is it that we are the only ones to have had these side effects? Why us? Why are these symptoms so specific? How come this isn’t so widespread. I would love to know what it is about the very specific circumstances that got us here. Do we have something we all share in common that led us to LC?

Acute stress when we got Covid?

Multiple Covid infections?

Something in our genes?

Why did I get LC at 37 years old when an 80 year old who had Covid didn’t get LC after?