Human growth is a common ground for a number of human social and biological-physical sciences, including psychology, sociology, anthropology, embryology, genetics, and medical science, but psychology stands between these sciences with the clear distinction of dealing with this phenomenon and has established a branch specialized in its study, which is the science of growth psychology.
And this science appeared in the late nineteenth century, and it was focused on special age periods and remained that way for long, consecutive decades, and early interests were limited to school children, then interest extended to the preschool years, and then to the cradle age (newborn and infant), To the fetal stage (prenatal stage).
After the First World War
Shortly after the First World War, research on adolescence began to appear and spread, and during the interwar period, some studies on early adulthood appeared, but they did not address growth at this stage in the usual sense but focused on specific issues such as the intelligence of adults and their personality traits.
After the Second World War.
Since the Second World War, there has been a gradual increase in interest in adulthood, especially with the increase in interest in the adult education movement. As for the concern for the elderly, it did not appear clearly until the beginning of the sixties of this century, and the reason for this was the rapid increase in their number and percentage in the general population statistics, and what that requires A study of their problems and determining the types of services that should be directed to them.
Among the important motives that guided the research in the psychology of growth are practical necessities, and the desire to solve the problems that individuals suffer from at a certain age, including that childhood research began at its origin to overcome the educational and educational difficulties of primary school pupils and then turned to the problems associated with the party of upbringing. Children in general and the focus of research in the cradle stage is the desire to know what preparations are available to the newborn with which he is born. As for the research in the stage of adulthood, he was directed by the motivation to study the practical problems related to marital compatibility and the impact of family destruction on the child, and then directed the research to Area of ageing.