Older-age bipolar disorder (OABD), which has been defined as the occurrence of bipolar disorder in individuals who are aged 60 years or older  represents as much as one-quarter of the population with bipolar disorder. In spite of the early mortality that is known to occur among individuals with bipolar disorder , the absolute numbers of individuals with mental health conditions such as OABD are expected to increase in upcoming years. Given these global demographic changes and emerging evidence base, there has been growing interest in OABD. However, complicating the study and characterisation of OABD, there is substantial variability in clinical expression, such as early onset versus late onset illness with a potentially different pathogenesis, clinical course and care needs. A hierarchical terminology for OABD that considers age of onset and course of illness has been proposed by the International Society for Bipolar Disorders Task Force on Older-Age Bipolar Disorder .