numbers must be hard to translate; this isn't the first time I've seen mixed up numbers like these. I'm pretty sure he was younger than twelve when he moved there, maybe 6 years old. No matter how you look at it he was still in the single digits because he's in high school now.
well. there's also the childhood album and they looked like nursery-age at the time. maybe they also knew each other already before becoming neighbors...
It must be translation error somewhere. It happens. I'm just so grateful to be able to read this.
So he moved into the room when he was 12 and he's been living in it for 10 years.........so that means he is 22 years old...........seems the ghosts aren't the only strange things in this manga.