To start with my argument, let's think of Madotsuki's room. It could possibly be a one-room apartment. You don't have to think much about her necessities like a bathroom. It is a game. However, everything in this game is consistent as far as the sizing of things. She is living in a tall, slender tower and her apartment is the length of the building when you walk outside. This is important when noting Madotsuki probably lives by herself.
Now, why would a younger girl live by herself like this? I think she would at least have to be 16 in order to live alone like this, probably living on mental disability or something. Sure, there could be a similar sized room beyond her door, but I think it would just be a hallway and/or stairs. Stairs are required in buildings like this for emergency exit, noticeably increasing the size needed for this slender apartment complex. It is harder to assume there would be another room.
Again, it would seem unusual to allow a girl any younger than 16 to live alone like this.
Edit: this probably isn't necessary to note, but she is likely chibi, like all the other people who seem proportioned like her.
2nd Edit: Look at Konata, a high school student!
Last edited 09/06/09(Tue)12:19.