Thanks - been a long time since I saw 21 - or even 51 - so it never came up when I was purchasing mine.
Same here (not so much 51 but definitely 21).
However, my son is only a year or so from his 18th birthday so he and I have been brushing up on Virginia and Federal gun purchasing laws, and trying to keep track of the various proposed revisions. It’s actually somewhat time consuming. Of course, in a sane USA where the government followed the Constitution we would not need to be so diligent - but these are the times we love in.