Who said young adult books were just for young adults? According to an oft-cited study from Publisher's Weekly , over half of YA readers are adults. Though they typically focus on teenage characters, YA literature holds an undeniable appeal for adults— perhaps because the fundamentals of life don't change all that much. You go through these cycles and experience the same things over and over again," popular YA author Jenny Han tells OprahMag. Han's To All the Boys trilogy , a hit among teenagers and grown-ups alike , demonstrates the wide popularity of the genre.