Could it be side effects from having gotten Covid or the Covid vaccine? I had gotten the virus 3 times even though I did get the vaccine and booster and now two-three years later I have vascular problems. I had it in my family tree but I did not suffer from it before. I think the virus turned on the genetic switch. Maybe that is what is going on in China.
Nobody's sure about the covid vaccination side effects though but one thing is for sure is that inheritance of any illnesses could come out anytime especially when you are getting older.
I have never heard about someone complaining about their health declining after they took the vaccination not even the old ones talking about those who are at the age of 60s to 80s.