Age of depression onset was studied in 183 consecutively hospitalized elderly patients with major depression. Patients with both depression and dementia had onset of depression at a significantly later age than patients with depression alone. Depressives with reversible dementia had age of onset comparable to that of depressives with irreversible dementia. These findings suggest that late-onset depression is a heterogeneous syndrome and includes a considerable number of patients who develop depression as part of a dementing illness.
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The corresponding record at NLM can be accessed at https://www.ncbi.nlm.nih.gov/pubmed/8399805