As a seasoned citizen who last had a cold ~ 20 years ago, I’ll quote that great philosopher Gordon Sumner...
Who has that gene?
“It’s probably me”
For us old folks it could possibly be that we all had the child hood diseases, as I did. Never had the Flu or the vaccine. Haven’t even had a cold for years. No covid and no vaccine. I have been taken all the essential vitamins for years. I added Zinc. I already had all the others. Strong immune system.