Unsurprising Trend That Surprises Someone

The newest Harry Potter film got a large chunk of its opening weekend cash from young adults, and the NYT seems impressed by this.  Geez, I wonder why these folks would be into Harry and the gang?  Perhaps the folks who read the books and showed up to the first six movies aged?   The reporter wants to play up the marketing department at Warner Brothers, but seems to forget that the books and the previous movies did a fine job of setting the stage for the last two movies.  No, it was the posters....