Book publishers had a profitable year last year according to statistics released by the Association of American Publishers (AAP), which showed that all categories of publishing saw a 4.9% rise in sales for the first three quarters of 2014, while the overall Trade publishing sector saw a sales increase of 2.8%.

Young adult and children’s books particularly flew off the shelves, as evidenced by the whopping 22.4% increase from January-September 2013 to the same period in 2014. At the same time, adult fiction and nonfiction sales were down by 3.3%.

This doesn’t necessarily mean that adults are reading less, but rather that they may be reading more YA. It wouldn’t be a surprise, given that a 2012 survey by Bower Market Research found that adults buy 55% of young adult novels, 28% of which belong to the 33 to 44 year old demographic. This statistic galvanized a debate this past summer, with criticism aimed at adults who enjoy reading YA, and a corresponding wave of pieces defending adults who read YA.

AAP also found that e-book sales in the YA category saw the most growth, with a 52.7% increase. But tech-savvy teens aren’t necessarily responsible for the growth—Nielsen Book just released the results of a study that shows that teens actually buy fewer e-books than their elders. In contrast to 23% of 18-29 year olds and 25% of 30-44 year olds who buy e-books, only 20% of readers aged 13-17 buy digital publications.