A better question would be ‘How many years do we save’ because the vast majority of the people dying from covid-19 are old people who already suffer from one or more prior diseases.

The average life lost in Vietnam or Afghanistan had maybe 55-60 years left, had it not been for the bullet that cut it short. The average age of covid-19 victims is maybe 73 or so, and those people would in average have lived another 0-5 years (typically less than the average life span for men of 78.5 years because of the prior illness).