11): It's quite normal for a periodical magazine to discuss "love among elementary school students" and do a survey on whether said children are "going out with someone right now", 20% of elementary school-age children answered said quesiton with "Yes", Otone merely commented that she finds the magazine's material too complicated for her to bother with, while Onee-san merely commented that "today's kids are quite precocious".
I definitely would believe it if 20% of elementary schoolers were dating. There would sometimes be some couples back when I was a kid, in-fact, when I was in 5th grade one of my friends was dating a girl, and that was quite a while ago, I can imagine modern day children being more precocious about dating. Of course the majority are likely just innocent crushes with “dating” being just playing together and stuff.