Fans of Bruce Willis Search for Answers About His Condition, Life Expectancy Bruce Willis was initially diagnosed with aphasia in March 2022. ET Source: The Mega AgencyFans of Bruce Willis have watched in awe, and with sorrow, as his family has opened up about the actor's health struggles. However, as time goes on, some of Willis' fans worry about how much longer the actor has. Source: The Mega AgencyArticle continues below advertisementWhen was Bruce Willis Diagnosed with dementia? According to the Cleveland Clinic, the average life expectancy of someone with this disorder is seven to 13 years after the onset of symptoms.