Probably not - after a certain age, young chidren do notice differences, especially if they have not been exposed to people who are unlike themselves. They may find these differences interesting, or they may find them threatening. And even if their parents do not discuss or react to these differences, children are bombarded by messages - some subtle, some not so subtle - from adults, peers, the media, and society in general. By the time they reach elementary school, they are aware of differences, and some have already developed prejudices against people who are different.