Maybe older than you. He's registered here but he rarely ever posts.
It would be informative to know the dosage level he takes of those. I am around lots of people all the time, with the real test being the last few days when people were not social distancing at all (ANIMALS).
I take lots of supplements these days, but for the Vid, I take 1,000mg of C three times a day when I remember. 5,000IU of D, and 100mg zinc.
People with dark skin who live in climates with less sunshine hours have trouble absorbing vitamin D, so that might be something he would need to look into.