Gila County looks to begin Pfizer vaccines for those 12 and up pending FDA approval Gila County hopes to get additional Pfizer vaccines Upon a pending FDA approval of the Pfizer vaccine for those 12 years and older, Gila County officials are hoping to head into schools to get children vaccinated. GILA COUNTY, Ariz. - Pfizer expects the FDA to make a ruling soon on approving the COVID-19 vaccine for those 12 and older and the decision will have broad implications as cities and counties attempt to hit herd immunity in Arizona. Gila County health officials have been waiting almost a year now to use a secret weapon in the battle against COVID-19 and they say next week they may finally use it.