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I could not definitelyremember when I began to share with others. Probably at my age of 3 to 6, I could share with other sometimes. And when my cousin brother was born, adults in my family asked me must share everything of mine to my cousin brother. We were in the same house until I graduated from middle school.And my favorite age group is Pre-k to Kindergarten. The children at this age can share their own mind with others. They have the imagination for playing, drawing, etc. They begin to build a rule in their mind, many things they began to learn to build a correct mind.