Final answer:
Children develop a sense of self and identify as individuals between 3-5 years old through the theory-of-mind concept and self-concept formation.
Explanation:
Children identify as individuals between 3 to 5 years old when they develop the ability known as theory-of-mind (TOM), understanding that others have thoughts and beliefs different from their own.
This cognitive change leads to the recognition of personality traits and group memberships. By age 6, children can identify themselves in terms of group identities like being a first grader.
Establishing a self-concept in early childhood facilitates social behavior, autonomy, and the exploration of gender roles, setting the foundation for a positive sense of self.
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