From NRA-ILA:

In its initial complaint, NRA made clear that Florida’s age restriction violated the U.S. Constitution on multiple counts. First, NRA noted that the ban was unconstitutional on its face – as the “ban infringes upon, and imposes an impermissible burden upon, the Second Amendment rights​.” Second, the complaint made clear that the new prohibition was an unconstitutional violation of the Second Amendment as applied to young women ages 18-20, who, as a cohort, are responsible for a minuscule percentage of overall violent crime.