Immune System: How Aging Can Affect It

COVID-19 has added another health hazard for older adults. Once infected with the virus, people in their 60s, 70s, 80s and above are at increasingly higher risk of experiencing severe COVID-19 illness, hospitalization and death. Although its difficult to precisely measure the impact of immune-system aging, "We know that it adds a massive risk. Those over 80 are 260-fold more likely to die from COVID-19 than those between 18 and 39," says Janko Nikolich-Žugich, MD, PhD, department head and professor of immunobiology at the College of Medicine – Tucson.