With few exceptions, influenza vaccines are recommended for everyone 6 months and older (see https://www.cdc.gov/flu/prevent/vaccinations.htm ). However, vaccination rates vary between countries, and can vary at country level between different age groups and risk groups. For example, less resourced countries may have limited vaccine available; even when vaccine is available, there are several factors which can contribute to low vaccination use (summarized here: https://www.who.int/europe/news-room/fact-sheets/item/influenza-vaccination-coverage-and-effectiveness ).