2,3 It has been observed that between 19, the relative frequency of late-onset bipolar disorder increased from 1% to 11%. Although BD is not as common among older adults as it is among younger adults, available evidence indicates that the total number of older adults with BD is expected to increase significantly over the next few decades. Individuals are diagnosed with BD-II if they experience at least 1 hypomanic episode and at least 1 major depressive episode without any manic episodes. A diagnosis of BD-I is established if an individual experiences at least 1 manic episode with additional major depressive and/or hypomanic episodes. 1 In the DSM-5, there are 2 subtypes of BD: bipolar I disorder (BD-I) and bipolar II disorder (BD-II). The DSM-5 describes bipolar disorder (BD) as a condition that is characterized by recurrent and/or cyclical episodes of mania or hypomania and depression.