Characteristics and Treatment of Bipolar Disorder in the Elderly

Bipolar disorder, though more prevalent in younger adults, can persist or newly emerge in later life, presenting distinct diagnostic, clinical, and therapeutic considerations. Bipolar disorder in the elderly encompasses cases of early-onset illness persisting into old age, depression later evolving into mania/hypomania, and true late-onset presentations, which may be primary or secondary to medical, neurological, or pharmacological factors. Prevalence declines markedly with age in community samples, yet the disorder remains common in geriatric psychiatric settings. Compared to early-onset cases, late-life presentations often exhibit attenuated classical manic symptoms, greater irritability or mixed states, and higher rates of cognitive impairment and medical comorbidity. Sex differences include greater anxiety and mood severity in females, and higher comorbid substance use in males. Recurrent mood episodes may accelerate cognitive decline and increase dementia risk, whereas long-term lithium use may offer neuroprotective benefits. Pharmacological management parallels that in younger adults but requires dose adjustments and vigilance for drug interactions, altered pharmacokinetics, and side effects. Overall outcomes are generally favorable, though complicated by comorbidities and elevated mortality risk, underscoring the need for comprehensive, multidisciplinary care in this population.