[So, whether they liked it or not, there were people like him who were destined for such a role; it wasn't too unlike a hereditary monarchy, except that it wasn't the entire world that the next line was put in charge of. While the Avatar got all of those powers, it still sounded like quite a heavy burden to anyone, especially those who wouldn't want to be deprived of a normal life.]

...Can you choose not to fulfill the duties of the Avatar, even if you were born to become one?

[Ai was 17 and she couldn't imagine having that big of a responsibility when this young. She had her fair share, but she was still just a simple girl.]

How many years do you have left until you reach that age?

[She could tell that he wasn't exactly 16 yet.]