The Moderna and the Johnson & Johnson vaccine are authorized for those 18 and up. Illinois Gov. J.B. Pritzker has acknowledged fewer doses will be available as compared to other ages groups, emphasizing it's not under the state's control. "We're at a point where the variants are rising," Pritzker said at a news conference Thursday, explaining his reason for lowering the age requirement. "They're coming at the population so fast at every age, we need to make sure that we open this up to everybody." In the city of Chicago, however, 16- and 17-year-olds won't be able to sign up to receive the vaccine until the week of April 19.