Seminole County already seeing vaccines demand for children after Pfizer receives FDA approval Seminole County prepares to vaccinate children 12-15 soon Tags: Seminole County already seeing vaccines demand for children after Pfizer receives FDA approval ORLANDO, Fla. – Central Florida counties could begin administering the Pfizer coronavirus vaccines to children between 12 and 15 years old as soon as next week but officials say there is still a lot of preparation to begin those efforts. U.S. regulators on Monday expanded the use of Pfizer’s COVID-19 vaccine to children as young as 12, offering a way to protect the nation’s adolescents before they head back to school in the fall and paving the way for them to return to more normal activities.