The best way to protect against flu and its potentially serious complications is with a flu vaccine. CDC recommends that almost everyone 6 months and older get a seasonal flu vaccine each year, ideally by the end of October. As long as flu viruses are circulating, vaccination should continue throughout flu season, even into January or later.
While flu seasons vary in severity, during most seasons, people 65 years and older bear the greatest burden of severe flu disease. In recent years, for example, it’s estimated that between 70 percent and 85 percent of seasonal flu-related deaths have occurred in people 65 years and older, and between 50 percent and 70 percent of seasonal flu-related hospitalizations have occurred among people in this age group.