Amir is three years old. When someone asks him, “Where is your nose?” he cheerfully points to it. Which of Piaget’s cognitive development stages has he reached?

At age three, Amir is in Piaget’s preoperational stage, which typically lasts from about ages 2 to 7. His ability to understand the question and point to his nose shows he can use simple mental representations, a feature of this stage. The sensorimotor stage occurs earlier, from birth to about age 2.

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