For a long time, research on developmental issues in the biological and social sciences was mostly concerned with the early parts of life, such as infancy and adolescence. Studies paying full attention to people after they had passed through late adolescence were rare even though we all know that humans continue to develop. The dynamics of adult life can be as forceful and full of transitory states as is life before 20. Individual development is a lifelong process: from the moment of conception to the moment of death. Recently, more and more researchers have turned their attention to the problems of development and aging in later periods of.
