That’s not how all vaccines work. Moderna and Pfizer are mRNA vaccines, and don’t have the actual virus inside.
A list of comorbids is available from Pennsylvania. It’s interesting, surprising and then after more thought, not surprising.
In order of prominence among the dead:
1) Dementia
2) Hypertension
3) Diabetes
way down the list . . . Obesity
First of all, survival is very likely for the whole population, but the whole population is not 60+ yrs old. It’s much less likely at older age.
Second . . . the idea that if you’re old but don’t have a comorbidity you’re okay . . . doesn’t really fly. 77% of people over 65 have hypertension.
Lastly, the new variant down in the city of 2 million, Manaus, Brazil has many in the sample of infected who already had Covid. This is bad.