“…The age difference has also been found in other articles [ [12] , [13] , [14] , [15] , [16] ]. Moreover, it is worth noting that aging itself is a prominent risk factor for severe disease and death from COVID-19 [ 17 , 18 ]. In fact, the elderly patients have a high rate of non-specific complaints, lack of specificity in clinical manifestations, various underlying diseases, cognitive impairment, multi-drug sharing, organ aging, malnutrition, immune deficiency.…”