Later, adult development and aging began to assume more importance. Its antecedents were different from those that led to the founding of experimental psychology.In its early years, developmental psychology was primarily concerned with child and adolescent development. As a discipline, it arose shortly after the emergence of scientific psychology in the latter part of the nineteenth century. In addition, the topic cuts across nations and cultures, adding to the diversity of subject matter and approaches. Developmental psychology is concerned with constancy and change in psychological functioning over the life span.
Human development is the concern of many disciplines, including biology, sociology, anthropology, education, and medicine.