fifteener

noun2

1. •
   (UK, informal) A film assigned an age rating of 15, those under 15 not being permitted to view it.

   • Not intensely bloody decapitation, but the sort of violence you'd see in a fifteener. — 2009
2. •
   (informal) A book or other printed item that was printed in the 15th century (thus, during the first half-century of printing).