Inclusion Criteria:  meeting diagnostic criteria according to Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) for bipolar disorder, either subtype I or II; being aged over 60 years old; being in full or partial remission Young Mania Rating Scale (YMRS) ≤ 10, Hamilton Depression Rating Scale (HDRS) ≤ 14) at the time of the inclusion and assessment; presence of mild to moderate functional impairment as measured by the Functional Assessment Short Test (FAST) ≥ 11 providing written informed consent to participate.  Exclusion Criteria:  presenting an Intelligence Quotient (IQ) lower than 85; having been received any kind of structured psychological intervention in the six previous months; presence of central nervous system (CNS) condition, other than psychiatric, than may influence neurocognitive performance, (such as neurological diseases) or any physical condition that may hamper participation or correct assimilation of the contents of the intervention, (such as severe visual and/or hearing impairment); presenting any other comorbid psychiatric condition except for sleep and/or anxiety disorders, and having received electroconvulsive therapy in the prior six months.