The former home of children's book writer Astrid Lindgren, known internationally for the Pippi Longstocking series, is being opened to the public — except for children.

Starting Saturday, the Astrid Lindgren Society is offering guided tours of the Stockholm apartment where Lindgren lived and worked until her death in 2002.

"This is where timeless classics such as Pippi Longstocking' countless letters and articles were written," the society says.

Pippi Longstocking

Astrid Lindgren introduced the world to Pippi Longstocking, who would become her most famous creation, in 1945. (Pressens Bild/AFP/Getty Images)

Lindgren's family has preserved the apartment as it was when she lived there.

Tours must be booked in advance on the society's webpage and only 12 people will be allowed at a time.

However, in a move that appeared at odds with Lindgren's respect and love for children, the society said visitors must be 15 or older.

Stockholm is already home to Junnibacken, a children's museum populated with characters from Lindgren's stories as well as from other famous Swedish children's tales.

Lindgren is also the namesake for the world's biggest prize for children's literature. In 2002, the Swedish government established the Astrid Lindgren Memorial Award. Celebrating authors, illustrators, storytellers and champions of reading who work "in the spirit of Astrid Lindgren," the annual prize carries a purse of 5 million Swedish krona (about $766,000 Cdn), making it one richest literary prizes in the world. 

For the upcoming 2016 edition, 215 candidates from 59 countries have been nominated, with the winner to be announced on April 5. 

Sweden Astrid Lindgren

The desk and typewriter of Swedish writer Astrid Lindgren stands in her former home at 46 Dalagatan Street in Stockholm. The former flat of the late children's author opens to the public as a museum on Saturday. (Jessica Gow/TT/Associated Press)