U.S. senior citizens (ages 65 +), are highly recommended to get the COVID-19 booster shot, as it will aid in your health maintenance and well-being.
Both the FDA and CDC have authorized boosters from all three of the vaccine authorized companies (Pfizer, Moderna and Johnson & Johnson)
The CDC published in in September of 2021, that the data shows that those were fully vaccinated with Moderna, had a 93% lowered risk of COVID-19 and hospitalization after being infected with COVID-19. Pfizer showed an 88% lowered risk and J&J, a 71% lowered risk.
Most scientist speculate that the original vaccine antibodies last form 6-8 months. At that point the antibodies reach their lowest number. After booster shots the antibodies can (in some cases)go to 10Xs what they were before.
Federal health authorities state that you can receive your booster from any of the three vaccines (i.e. if your vaccination was Moderna, you could get either the Pfizer or J&J booster). However, Dr. Fauci recommends staying with the same vaccine, as your vaccination, for your booster.
Health authorities are not sure as to how long the booster will be effective against COVID-19. They speculate that we could need boosters annually, like flu shots, due to the probability of the virus mutation. But on a brighter note, there is a possibility that the booster may cause the virus to weaken and be less likely to mutate.