Final answer:
Children begin to show differences in play activities related to gender during the preschool years, typically between the ages of three and five.
Step-by-step explanation:
Children begin to show differences in play activities related to gender during the preschool years, typically between the ages of three and five. At this stage of development, boys and girls start to prefer play activities that align with traditional gender roles. Boys may be more interested in playing with cars, blocks, or sports-related toys, while girls may be more drawn to dolls, dress-up, or pretend play.