Before revision:  I show that these variations across age and gender are quantitatively explained by the levels of the ACE2 protein in the lungs . This correlation also rationalizes the association between Covid-19 lethality and hypertension. Surprisingly , despite ACE2 is the viral receptor, higher values of ACE2 lead to lower fatality.
After revision:  I show that these variations across age and gender are quantitatively explained by the levels of the ACE2 protein in the lungs but surprisingly , despite ACE2 is the viral receptor, higher values of ACE2 lead to lower fatality.