Have you ever watched someone die of cancer. The treatments if you get them are horrid, and the pain most people get along with the cancer is unbearable. To the point you usually spend your last few days to a couple of weeks so drugged you never wake up, and even at that you are in pain 24 hours per day. And often you actually die by getting no water nor food the last few days while you are unconscious. And at 80 it is very unlikely you will live for years, months is much more like it.
I would take Covid, and suffer for 14 to 21 days in a heartbeat. This is coming from some one who is older.