23. "It's Just For Children"
Go away. If JK wrote ended the entire series with one book where Harry just finished first year, then yes, maybe it would be for children. The fact that she wrote about his entire teenage years right up until adulthood shows that Harry grew up and you grew up with him. The themes in Harry Potter are far from childish and being an adult who still finds happiness in the Harry Potter books does not make you immature at all. It's a series that families can enjoy together and you'll probably keep it in your heart forever.