In the sixth book, Harry Potter and the Half-Blood Prince Harry enters a tumultuous puberty that, Rowling says, is based on her and her younger sister's own difficult teenage years.
Kuuendas raamatus, “Harry Potter ja segavereline prints”, siseneb Harry tormilisse puberteediikka, mis on Rowlingu jutul põhinenud tema ja tema noorema õe enda raskustel nende teismeliseaastatel.