True, COVID is not the flu. BUT I tested positive for COVID-19 in early May and was ‘sick’ for about 4 days. The mildest ‘flu’ I have ever had included 4 ibuprofen, one night a 99 degree temp, and fatigue. (My wife [over 65 as well] and son both tested positive and had more severe symptoms but son kept working from home.)
It seems to impact everyone differently. I suspect those with milder symptoms either have more robust immune responses or contracted a weaker form of the virus.