text: bipolar, is this inherited and  if no signs of bipolar,can one get it at the age of 42?   some of the medical community still don't know what triggers the onset of this disease. it happens at any age and can be found to be in family lines and not in others. a medical exam is your best bet. there are lots of meds out there to help get through it. although some meds can cause side effects that are worse than the actual symtom. consult a profressional. its the best and safest method.