The development patterns of both historical and contemporary demographic transitions are essential in understanding the out-comes of age structure changes among the countries. Existing literature analyzing demographic transition as a precursor to popu-lation ageing does not classify countries or regions worldwide by the scale and dynamics of those processes.
The aim of this paper is to identify and describe the differentiation of quantum and tempo effects of changes taking place during the demographic tran-sition through classification of sub-regions and selected countries worldwide. The results of this research, based on the historical vital statistics starting from as far as 1736 and future projections until 2100, feature how sub-regions and selected countries in the world are differentiated in terms of the scale and dynamics of the demographic transition process.