This document provides information on late life depression, including its epidemiology, presentation, risk factors, screening and diagnostic tools, and treatment options. Specifically, it discusses a study that found escitalopram effective in preventing relapse of major depressive disorder in elderly patients. The study had two periods: an initial 12-week open-label acute treatment with escitalopram, followed by a 24-week double-blind continuation treatment with escitalopram or placebo. Results showed escitalopram significantly reduced relapse rates and was well tolerated as a continuation treatment for late life depression.