COVID‐19(19) SARS‐CoV‐2(13) age(13) Older(13) aging(12) Inflammation(10) COVID‐19(10) expression(10) disease(9) characterized(9) senescence(9) Factor(8) individual(8) disease severity(8) Cell(8) coronavirus(8) COVID‐19 patient(8) severity(8) Antiviral(8) reduced(7) individuals(7) ACE2(6) cellular(6) accumulate(6) tissue damage(6) association(6) contribute(6) subset(6) expressed(6) receptor(6)