In the previous books, Harry is written as a child, but Rowling states that in the fourth novel, Harry Potter and the Goblet of Fire, "Harry's horizons are literally and metaphorically widening as he grows older."
Eelmistes raamatutes on Harryt kirjeldatud kui last, kuid Rowling ütleb, et neljandas raamatus, „Harry Potter ja tulepeeker“, „Harry horisondid on otseselt ja piltlikult suurenemas, kui ta kasvab.”