Everyone in America is getting a Covid booster (unlike the UK, where it's only the very old)

It makes sense to vaccinate everyone because

a) everyone, even healthy people in their 20s and 30s, can suffer long-COVID, increased rate of stroke, increased rate of heart disease

b) having a large % of vaccinated people in the community acts as a "ring" of protection around medically high risk people because it helps cut down on transmission