At approximately what age do boys and girls tend to understand the concept of gender constancy?

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Gender constancy is the understanding that one's gender identity does not change regardless of external factors such as appearance or behavior. Research suggests that most children acquire gender constancy between the ages of 4 and 5. Before this age, children may have a sense of being a boy or a girl, but they may not fully grasp the concept that gender is stable and unchanging over time.

At Approximately What Age Do Boys and Girls Tend to Understand