The Centers for Disease Control and Prevention recommends that everyone 6 months of age and older get vaccinated against the flu. It is especially important for certain groups—children under the age of 5, adults 65 years of age and older, pregnant women, and people with chronic health conditions such as asthma, diabetes, and heart disease—to get the flu vaccine. These groups are at greater risk for serious complications from the flu, which can include bacterial pneumonia, bronchitis, ear and sinus infections, and dehydration.