This article discusses and analyzes the theory of generations and intergenerational relations. Intergenerational relations become an object for interdisciplinary study, especially in sociological science, because of the rapid changes which are taking place in society. The researching of representatives of different generations is necessary to study the trends of progress in society.  Generation are interrelated. Every previous generation shapes the present generation, and the present generation shapes the future generation. The analysis of generations introduces new theoretical aspects in the study of the processes of historical development in the social area.