The research and knowledge of demographic factors (fertility, population ageing, migration, etc.) of certain population is important because of their relevance in determining the direction of socio-economic development. One of the characteristic demographic processes in Bosnia and Herzegovina is the process of the population's demographic ageing. The process of demographic ageing is a demographic problem that has an impact on almost all the spheres of socio-economic life, like the pension, health and education system, as well as a labor market. The numerical reduction and the working contingent's ageing bring in question faster economic development of a country. It is important to note that the process of demographic ageing is' closely linked to natural movement of population. Namely, the decrease in birth rate affects the reduction of the young population's, reduces the number of the most reproductive, mature and work ready population. As a consequence qf these demographic changes, there is an increase in the proportion of old people in the total population, as well as an increase in the total population's ageing. Regarding to that, the subject matter of the research relates to the process of demographic ageing in Bosnia and Herzegovina, while the main aim of the work is to identify the main reasons and consequences (Ole demographic ageing in Bosnia and Herzegovina. The planned research will be realized on the basis of the scientific methods of internal research (desk research). Statistical methods (descriptive and inferential statistics) will be usedfor the analysis and elaboration of the collected data.