We compared a group of adolescents with childhood-onset conduct disorder (C-CD), with a group of teenagers with adolescent-onset conduct disorder (A-CD), in relation to a set of neuropsychological, biographical, psychological, family, and community variables, and the overall and specific frequency of symptoms.Participants were 60 men and 11 women, 24 with C-CD and 47 with A-CD.Statistical analyzes depended on the type of variable analyzed.Participants with C-CD reported a higher frequency of antisocial behaviors, more violent behavior witnessed between their parents, a lower age of alcohol consumption, and more problems in school as a consequence of antisocial behaviors.These results tend to confirm that individuals with C-CD have a more negative profile of symptoms and associated difficulties.