I’m retired. I basically changed only two things in my weekly routine: I stopped going to a weekly meeting of about fifteen old men, and I stopped going to the local hairdresser, which is a small group of young women, most of whom have young children, and, I suspect, tend to work even if they are slightly ill, because they get paid by the haircut.

I usually get two or three colds and one or two flus a year. In the past fourteen months, not a sniffle.