When do children learn to share? I’ve been told they don’t really grasp the concept until around five years of age. My 2 year old shares with me. Tonight he was in a mood to share a lot with me – from the poopy diaper he handed to me, to the mouthfull of chewed up peanuts that he wouldn’t swallow, to the “nose picky” he fetched out of his nose that – I swear – looks like it came out of the nose of a 50-year old. How in the world does someone so small produce something so BIG?