As Baby Boomers move into older age, substance abuse among adults 50 and older has been on the rise, according to a Substance Abuse and Mental Health Services Administration study. It is estimated that 4.3 million American adults in the targeted age group (or 4.7 percent of this population) have abused an illicit substance in the past year. The most widely abused substance in this age group was marijuana/hashish at 44.9 percent, followed by nonmedical use of prescription drugs at 33.4 percent. It has been concluded that this rise in substance abuse among older adults will require the doubling of substance abuse treatment services for them by the year 2020.