De facto they can disarm everyone going group by group. Older people, young people, former military people, those who have had a DUI, those who have had any physical issue such as poor eyesight, dizziness, those who take medications for anxiety or sleep disorders, those who are around small children, those on the no-fly list...the subgroups of ineligible is infinite and everybody could be found to fit in some subgroup.
If one is deprived of the ability to balance their lack of size and strength to defend themselves against the stronger and younger people then there should be private security provided around the clock at no expense, just as is done for public officials. Old people are already targeted by ne’er do wells who know they are fragile physically.
And all of those today who claim that it “reasonable” to use an anonymous, non-verified “no fly list” of “terrorists” as a criteria for seizing firearms ....
But you CANNOT arrest (or even investigate!) a Muslim for terrorism. Until he shoots a room full of homosexuals.