I've told this story before. I'll say it again.
My great-uncle (unwillingly) got the shot at the age of 92. Up until that point, he was extremely healthy for his age and regularly bounced back from numerous illnesses that could easily take out someone less than half his age. Everyone who knew him was absolutely confident that he would live to be 100 at the very least.
Then, when he got his shot, it all went downhill.
In addition to showing signs of dementia (general forgetfulness, almost never speaking unless spoken to, and often aimlessly staring at the TV and randomly repeating things said by characters on whatever show he was watching), he suddenly developed cancer in early 2023. The cancer spread so fast that before anything could really be done, it had spread everywhere. And by everywhere, I mean his entire body. Seriously. I'm not making this up.
Obviously, treatment was unsuccessful, and he passed away in October of that year. He was 94.
His wife, a retired nurse, was the one who forced him to take that poison. If my grandma had lived to witness his passing (she died four months before him), I just know that she would have been screaming "I TOLD YOU SO!" because she did indeed warn her hundreds of times that it was bad news.