True about late-onset schizophrenia-
To diagnose late-onset schizophrenia, the patient should meet the DSM IV criteria for schizophrenia (including duration of at least 6 months) with the additional requirement that the onset of symptoms (including the prodrome) be at or above age 45. The prototypical patient is a middle-aged or elderly person who functioned moderately well through early adulthood (despite some premorbid schizoid or paranoid personality traits) and who exhibits persecutory delusions and auditory hallucinations and shows some improvement in positive symptoms with low-dose neuroleptic therapy, yet has a chronic course.
Onset after 45 yrs
Onset between 25-30 yrs
Prognosis is poor
Olfactory halucinations are common