Not necessarily. Some grow up to be wonderful people. It totally depends on their upbringing and peer group. Kids who bully others at young age may continue that for a while, but as they grow and change schools, the new peer group may refuse him the 'bully' status that he enjoyed ! Parents also play a great role in changing the child's behavior. I feel people who resort to bullying at workplace are those who never got a chance in childhood and feel that's the only way to gain attention. However, such people rarely stick to the same organization for long.