Eating right, exercise (from hard work tending my animals and garden), and avoiding antibiotics for the past 25 years has made my immune system strong.
I'm not afraid of COVID-19, just like I'm not afraid of the seasonal flu - I'll catch it, I'll beat it, and I'll keep on writing software and tending to my private food supply.
I should probably try to get back to riding my bicycle 50 miles a day. I was like superman in those days.