Onset of schizophrenia at age 100.

Schizophrenia is generally regarded as a disease starting in adolescence and early adulthood. Cases beginning after the age of 60 are rare. The authors present the case of a woman who, at the age of 100, developed an illness marked by delusions and hallucinations and who was diagnosed with schizophrenia, paranoid type. Authors discuss the differential diagnosis of psychotic symptoms presenting late in life.