https://www.siliconvalley.com/2021/04/28/pfizer-and-moderna-vaccines-reduce-covid-19-hospitalization-risk-by-94-among-older-adults-cdc-study-says/

The Pfizer/BioNTech and Moderna Covid-19 vaccines were found in the real world to be 94% effective against Covid-19 hospitalization among fully vaccinated adults ages 65 and older in the United States, according to a new US Centers for Disease Control and Prevention study.

The study also found that the vaccines were 64% effective among those older adults who were partially vaccinated, meaning they had only received one dose of vaccine so far.