As The Fault in Our Stars barrels into theaters this weekend virtually guaranteed to become a blockbuster, it can be hard to remember that once upon a time, an adult might have felt embarrassed to be caught reading the novel that inspired it. Not because it is bad—it isn’t—but because it was written for teenagers.

The once-unseemly notion that it’s acceptable for not-young adults to read young-adult fiction is now conventional wisdom. Today, grown-ups brandish their copies of teen novels with pride. There are endless lists of YA novels that adults should read, an “I read YA” campaign for grown-up YA fans, and confessional posts by adult YA addicts. But reading YA doesn’t make for much of a confession these days: A 2012 survey by a market research firm found that 55 percent of these books are bought by people older than 18. (The definition of YA is increasingly fuzzy, but it generally refers to books written for 12- to 17-year-olds. Meanwhile, the cultural definition of “young adult” now stretches practically to age 30, which may have something to do with this whole phenomenon.)

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