Which of the following is not true regarding delusional disorder?

Delusional disorders do not occur at an early age. Risk factors for development of delusional disorders- Advanced age Social isolation Sensory impairment or isolation (e.g. auditory or visual disturbances) Family history of delusional disorder Recent immigration (is also risk factor for schizophrenia) Ceain personality features ,like excessive interpersonal sensitivity (even tril interpersonal problems cause lot of negative emotions)