All people 6 months and older are recommended to receive an influenza vaccination each year.
Children aged 6 months through 8 years of age who have never received a seasonal flu vaccine need to get two doses of vaccine spaced at least 4 weeks apart. This season, other children in this age group may need two doses as well.
Certain people are at "high risk" of serious complications from seasonal influenza. These include people 65 years and older, children younger than five years old, pregnant women, and people of any age with certain chronic medical conditions.
The best time to get vaccinated is as soon as the vaccine is available. You can still get a flu shot through the fall, winter or spring, since flu season usually peaks in February but continues through May.
Influenza de temporada (gripe) (Flu Info in Spanish from CDC)