a model which maps the basis of human development where adulthood is split into the following categories- early, middle and late. Each of these segments has an entry during the first part of the stage and transitional stage as you come to the end of a specific stage. This was first proposed by U.S. psychologist Daniel Levinson.
LEVINSON’S ADULT DEVELOPMENT THEORY: “One of the many models of human developing is levinson’s adult development theory, which suggests there are three stages to life, where each stage is also split into three separate periods.”