Baltimore County health officials kicked off the first day of expanded vaccine eligibility Tuesday with children as young as six months. “This is completely and totally a game-changer. Now, we can get all of society, all of our family vaccinated,” Baltimore Co. Health Officer Dr. Gregory Branch said. Tuesday marked the first day for children aged six months to five years old can get vaccinated against COVID-19. Will Green brought his daughter Eirian for her first dose. He took the opportunity to get boosted, as well.