Objectives: The aim of the study was to assess the impact of demographic changes of the population, mainly the process of aging, on the structure of morbidity in gynaecology, and also to determine the direction of emerging changes.

Material and methods: Medical documentation was analysed for all patients of the Gynaecological Department of the Clinical Hospital in Białystok, who were hospitalized in the years 1996, 2000 and 2004. A database containing information about 8428 patients was created.

Results and conclusions: There is an increase in the number of women at the retirement age treated at a gynaecological ward. The average age of patients hospitalized due to endometrial cancer has increased by about 12 years. The age of patients treated due to uterine fibroids increased by four years, while the average age of women treated due to static disorder increased by 8 years. Population aging is a process of progressive and significant impact on changing the structure of morbidity of gynaecological wards.