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Substance abuse among older adults is a looming public health concern. The number of Americans aged 50+ years with a substance use disorder is projected to double from 2.8 million in 2002-2006 to 5.7 million in 2020. The authors provide a review of epidemiological findings for this understudied area of research by focusing on illicit drug use disorders and nonmedical use of prescription drugs among adults aged 50+ years. MEDLINE and PsychInfo were searched using keywords drug use, drug abuse, drug misuse, substance use disorder, and prescription drug abuse. Using the related-articles link, additional articles were screened for inclusion. This review included articles published between 1990 and 2010. Results from multiple sources indicated a much higher rate of illicit drug use and nonmedical use of prescription drugs and drug-related treatment admissions for persons 50 to …