Kids have a special communication with all animals. They seem to communicate with them, using simpler and gentler methods. When they get older, they loose this ability, they get interested in other things for a while, but then they usually come back to horses, but with a different view and training ways and such. Yes we can relearn it, it just takes time. Of course there is exceptions to what I all said, kids can be abusive and worse than adults, but typically it is actually the opposite. Think about it, children are young and they are controlled by the parents/elders. When they are introduced animals, they realize, wow, I can control and be the leader and boss around this animal. They learn leadership, patience, friendship, and many other great characteristics. Usually the kids are so proud they can control this big (ok, not all the time) animal, and 'look Daddy, he is bowing!' and animals understand that they are young and learning, and try as hard as they can to please and learn what the confusing signals the child is giving.
“Good things come to those who wait… greater things come to those who get off their ass and do anything to make it happen.” - Unknown