CXCL10 and COVID-19: This finding agrees with the negative association reported in the MyoAge cohort between blood CXCL10 concentration and working memory performance in older subjects, which was possibly associated with age-related altered methylation within the CXCL10 gene promoter [45] and with the critical role of CXCL10 as a marker of a restricted repertoire of T cells in older subjects predicting a negative outcome of COVID-19 [28].