If you know any, do you find Mormons to be different or happier than non-Mormons?

A family member and I have become acquainted with Mormons and found them to be somehow different than other people we know. The teens especially seem to us to be peaceful and well mannered. Have you found this to be the case if you know any Mormons? I am not nor will ever be Latter Day Saint but I was just wondering about this.
Many years ago my family and I went to Colorado to a park. The small town in which we picnicked had a large Mormon membership and the children were so quiet you hardly knew they were there in the park near us. It was quite odd.