My son is supposed to lein this Shabbos. Last night I pointed out to him that R’ Tzvi Pesach Frank in Mikraei Kodesh (actually, it’s in the notes, which I believe were written by RTPF’s grandson) has a safeik whether he can lein parshas shekalim. Only those over 20 years old were obligated in the mitzvah of machatzis hashekel. The Rama therefore writes that the minhag of giving coins as a zecher to machtzis ha’shekel is practiced only by those over 20. (There are Rishonim who hold that the shekalim collected in the midbar were an exception to the rule; the mitzvah applied for future generation to all those over bar mitzvah. The Rama clearly does not side with this view, but other Achronim do). By the same token, perhaps the parsha of shekalim should be read only by someone over 20. Yesh l’chaleik, but something to think about.