One of the established facts about Covid-19 is that it hits older people hardest — which is why stories of centenarians beating Covid-19 piqued the curiosity of geneticist Mayana Zatz. According to the Centers for Disease Control and Prevention, the risk of dying due to Covid-19 is 630 times higher in people over the age of 85 as compared to young adults ages 18 to 29. So how come some of the oldest of the old are surviving Covid-19 unharmed?
