We have to protect the old people first to prevent the most COVID-19 deaths. COVID-19 is most deadly to older people, so vaccinating the roughly 7-10% of people who are over 70 would prevent over 75% of COVID deaths.
This is the distribution of COVID-19 deaths by age in Israel.
The US has similar COVID-19 deaths by age. If the US vaccinate the roughly 40 million people over the age of 65 then 90% of COVID deaths could be prevented.
A little over 10% of the effort would provide 90% of the death prevention prevent.
SOURCES- David Wallave Wells, Ariek Kovler, Infoplease
Written By Brian Wang, Nextbigfuture.com