I got a bit of it when I was 30.
This kills many over 80.
My mother-in-law was recovering from heart surgery and then a stroke. However, what got her was pneumonia. She was only in her mid-seventies.
Hubby 78 has pneumonia now, luckily it’s just Bronchial type and caught in time. But having severe Glaucoma, Retinal Atrophy which could cause Blindness complicates what he can be treated with. No Cortisone, Steroids, Predisone, Allergy meds, or inhalers like Asthma users use, his has to be Steroid free.