In Graduate Thesis under the title 'Fictionalisation on the theme of ageing in the narrative prose of Croatian female writers of the first half of the 20th and 21st centuries' the characters of the old women are shown and the ways in which the topic is being discussed in the selected prose corpus of Croatian female writers within a hundred years. Since old age, as a part of the concept of body and corporeality is most frequently researched theme in literary scientific researches is analyzed in a form of women's letter where the body is one of the most common topics. With contemporary literary scientific approach and interpretative analysis of the relevant corpus from the first half of the 20th century, which includes transcripts (prose texts) of Zofka Kveder, Ivana Brlić-Mažuranić, Verka Škurla-Ilijić, Sida Košutić, Mila Miholjević, Zdenka Marković, Mara Švel-Gamiršek but also the appropriate transcripts from the beginning of the 21st century of Dubravka Ugrešić and Slavenka Drakulić in this thesis the characters of the old women are shown through various dimensions in these literary works. In this thesis research was done for the following concepts of age: motherhood, wisdom and spirituality, phisicality, wicker dimension, social and cultural context in which the characters of the old age were compared in a comparative approach to the corpus from the beginning of the 20th and 21st centuries. The research in graduate thesis leads to the conclusion that the issue of ageing is very present in the prose texts of Croatian writers since the beginning of the 20th century until today, which makes it relevant and valuable for (future) resarches.