People general don't think about reinventing their lives unless there's some impetus to do so. That impetus could be something big, like the loss of a loved one or hearing the diagnosis of a major illness. For others, reinvention can come after much quieter events, such as the acknowledgment of nagging dissatisfaction with one's life. The ultimate point of reinvention is to bring you greater happiness by putting your life in closer alignment with your life's purpose.