I have two brothers. One older, one younger. The younger one is in his mid fifties. He lives alone and works remotely. Overweight but otherwise in good physical health.
He seems the most cautious one in terms of trying to avoid all contact with other people.
On Christmas Day, he drove up to my older brothers house to see his sister-in-law and our elderly mother and stayed for 90 minutes. He arrived halfway through the meal, but would not sit at the specially (extended ). Instead he hovered at the kitchen island some way away. He brought his own coffee. He would not eat any of their food, though ate some cheese he bought himself. He avoided using their toilet.
After that he went and drove to a Marriott Hotel in the nearest city and spent the night there before driving back to his home town on Boxing Day.
I suppose I worry that Coronavirus has adversely affected his mental health, so that his concern to protect himself has taken on a rather obsessional quality.