A comparison of early-onset and late-onset depressive illness in the elderly

Elderly patients with early-onset and late-onset depressive illness presenting to psychiatrists for treatment were compared for social, demographic, and clinical measures. For most factors measured no statistically significant differences were found. In the early-onset cases, patients were significantly more severely depressed. There was some evidence for the hypotheses that family history is less important and biological factors more important in late-onset depression. It is suggested that the latter hypothesis should be tested by a range of the newer neuroanatomical and neurophysiological laboratory investigations. The findings indicate that neuroticism is an important underlying factor in both early-onset and late-onset depression in the elderly.