Symptoms of schizophrenia usually start between ages and 30. In rare cases, children have schizophrenia too.
Other conditions in which affective symptoms are superimposed upon or form part of a preexisting schizophrenic illness, or in which they coexist or alternate with other types of persistent delusional disorders, are classified under the appropriate category. Mood-incongruent delusions or hallucinations in affective disorders do not by themselves justify a diagnosis of schizoaffective disorder.
APA. American Psychiatric Association. . São Paulo: Manole.  1989. [ ] If in 1996, Pereira (p.52) stated that a pragmatic system of classification is not a deep psychopathological discourse, and that the DSM could not claim to be or to found a psychopathology, we must ask ourselves why the field of psychiatric and mental health consented so widely to abandon the entire tradition of debates in favor of a system based on statistics, cognitive adjustment, and the exclusion of subjectivity.