What’s the average lifespan of someone with bipolar disorder? Now that I’m in my 50s, and now that I’ve lived with the diagnosis for nearly three decades, I wonder if I’ll live as long as others without the disorder. According to research, probably not. When predicting lifespan, or longevity, researchers take some baseline perfectly healthy mythical creature and call their lifespan x. This varies with age at the time of measurement and is influenced by demographic and socio-economic factors. Then the researchers calculate longevity by naming a number of years less than x that a person is expected to live if they have a diagnosed medical condition. The idea is that the medical condition, or some related condition, will kill one off early.