Sigh... I knew this was going to happen. And by "this" I mean the comments.
They were originally 10-12 (which is bullshit, they don't look 10. Or 12. But whatever). But a year or so has already passed, meaning the older ones are 13. That's middle school already.
In OUR world, 13yo kids already have crushes, and some of them "date" (not sure exactly how, I just know they do). Some kids have sex at 13 (wake up, like it or not, it's a thing). And that's in OUR world. Now.
In the middle ages, 13-14 girls were already getting pregnant.
.....but y'all somehow think it's weird, or wrong, for 13yo Isekaier to have a crush.
Okay then.