Although antisocial personality disorder is only diagnosed in people over age 18, the symptoms are similar to those of conduct disorder, and the criteria for diagnosis include the onset of conduct disorder before the age of 15.
School-based programs from early childhood onward that teach conflict resolution, emotional literacy, and anger management skills have been shown to interrupt the development of antisocial behavior in low-risk students.
Though it is never too late to intervene, researchers warn that if by age eight a child has not learned ways other than coercion to meet his social goals, he has a high chance of continuing with antisocial behavior throughout his lifetime.
For those adolescents who have both AD/HD and a conduct disorder, up to 25 percent go on to develop antisocial personality disorder and the criminal behavior, substance abuse, and high rate of suicide attempts that are symptomatic of it.
Antisocial behavior can be broken down into two components: the presence of antisocial (i.e., angry, aggressive, or disobedient) behavior and the absence of prosocial (i.e., communicative, affirming, or cooperative) behavior.