“Vaccinations and better education about hygiene and public safety help reduce the number of flu infections each year. But influenza can affect anyone of any age group.  Certain populations are more at risk for serious health complications from the flu:  children under the age of five, especially those two years and younger, children 18 and under who take aspirin or medications that contain salicylate, adults ages 65 years and older, people with serious medical conditions including those immunosuppressed, people with severe obesity & American Indian and Native Alaskan people.”

healthline