Adult development

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Adult development refers to the changes that occur in biological and psychological domains of human life from the end of adolescence until the end of one's life. Changes that occur at the cellular level are partially explained by biological theories of adult development and aging. Biological changes often influence psychological and interpersonal/social developmental changes, which can be described by stage theories of human development. Stage theories typically focus on "age-appropriate" developmental tasks to be achieved at each stage. Erik Erikson and Carl Jung proposed stage theories of human development that encompass the entire life span, and emphasized the potential for positive change very late in life. The concept of adulthood has legal and socio-cultural definitions. The legal definition of an adult is a person who is fully grown or developed. This is referred to as the age of majority, which is age 18 in most cultures, although there is a variation from 15 to 21. Middle-aged...

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