When was adolescence first defined as a separate stage of life in the Western world?

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Adolescence was first defined as a separate stage of life in the Western world in the early 20th century. This was a time when psychologists and social scientists began to recognize the distinct physical, emotional, and cognitive changes that occur during this period of development. Prior to this, children were often viewed as mini-adults and not given specific attention during this stage of life.

When Was Adolescence First Defined as a Separate Stage of Life