Antisocial personality traits, as seen in a narcissist or psychopath, can first manifest in childhood. Symptoms include cruelty to animals, bullying behavior, social isolation, impulsiveness and explosions of anger. Antisocial traits are fully realized for individuals by age 20 or 30, according to Mayo Clinic.
Antisocial personality disorder is diagnosed if the symptoms have been present since the age of 15. Since the symptoms are considered long-standing and pervasive, antisocial personality disorder is diagnosed in adulthood. Although traits of antisocial personality disorder can materialize in childhood and adolescence, individuals under 18 cannot be diagnosed with the disorder. Antisocial personality disorder is 70 percent more prevalent in men than women, says Psych Central.
Individuals with antisocial personality disorder show a lack of empathy for others. They repeatedly violate the rights of others using intimidation, manipulation, dishonesty and misrepresentation, and lack remorse when engaging in these violations. Antisocial personality disorder is a life-long disorder where there is an enduring pattern of inner experience and behavior that deviates from the norm of the individual’s culture. The dysfunctional pattern of behavior manifests in two or more of the following areas of the person's life: cognition, interpersonal relationships, affect and impulse control. Symptoms of antisocial personality disorder lead to significant impairment or distress in social, work or other areas of functioning.