Hi Phizzy. I am under age sixty (though over age 50) and as far as I can tell I never had any Covid-19 symptoms. In contrast some of my co-workers have gotten Covid-19 twice despite taking all of the their Covid-19 shots even when using the same brand I took, namely the Moderna brand). I went about a year before getting my most recent booster shot because I wanted to wait for the bi-valent shot rather than taking another shot which was entirely of the same formulation I previously had. I having been taking vitamin-herbal supplements including vitamin D and vitamin D is known to offer protection from Covid-19. I'm thinking my body has a strong natural immunity to Covid-19 virus and/or that my supplement intake and mask use is protecting me from Covid-19.
I have been taking the flu shots for 3 or 4 years now and I noticed that they work excellently for me since I have not had any flu symptoms since I started taking them (my employer has them provided at work; they are administered by pharmacists from a Safeway store). Even more interestingly, I haven't had any cold symptoms either since I started getting flu shots. i used to get really bad cold and/or flu about once every one or two years when I was in a work environment around many people (instead of working at home or being unemployed), yet surprisingly I haven't had any colds (colds are produced by corona viruses) since I started getting flu shots.
I thought I might have some lingering Covid-19 vaccine induced Covid-19 spike proteins in my body tissues, and I wanted to get rid of any Covid-19 spike proteins I might have. I thus searched for any medical science articles which might say how to remove them. I discovered that a medical study on Covid-19 patients shows that Quercetin helps the body to destroy the Covid-19 spike proteins. I thus recently purchased a Quercetin supplement and started taking it as a result.