ALEX NABAUMF or many years, attention-deficit/hyperactivity disorder (ADHD) was thought of as a disorder of childhood; however, it is now increasingly being recognized as a chronic, lifelong disorder that persists into adulthood in approximately two-thirds of patients. 1 While our knowledge about ADHD in adults has increased, most research in this population focused on young or middle-aged adults; less is known about ADHD in older adults. Older adults with ADHD may be newly diagnosed at any point in their lives, or not at all. 2 Because ADHD may present differently in older adults than in children or young adults, and because it may impair domains of life in different ways, a closer look at late-life ADHD is needed. This article summarizes the literature on the prevalence, impairment, diagnosis, and treatment of ADHD in adults age >60.
Challenges in determining the prevalenceFew studies have examined the age-specific prevalence of ADHD among older adults. 3 Compared with childhood ADHD, adult ADHD is relatively neglected in epidemiological studies, largely due to the absence of well-established, validated diagnostic criteria. 1,4 Some experts have noted that DSM-5's ADHD criteria were designed for diagnosing children, and the children-focused symptom threshold may not be useful for adults because ADHD symptoms decline substantially with age. 2 One study evaluating DSM-5 ADHD criteria in young adults (N = 4,000, age 18 to 19) found ADHD was better diagnosed when the required number of clinically relevant inattention and hyperactivity symptoms was reduced from 6 to 5 for each category. 5 They also found the DSM-5 age-at-onset criterion of symptoms present