Using Goldberg's General Health Questionnaire (GHQ) to identify potential cases of mental disorders, we screened 246 randomly selected persons among the 116,616 people older than 65 in the metropolitan zone of Guadalajara; 86 subjects (35%) qualified as "cases"; this figure is much higher than that reported (20.8%) in the adult population in a previous study. Among the cases, 69% were female, 66% were widowed, and 50% were divorced; 44% had not finished gradeschool, 42% had no scholastic education, 54% were unemployed, and 40% worked at home. Factors associated with anxiety and severe depression, sleep disorders, psychosomatic symptoms, and problems in interpersonal relations were studied.