Supreme Leader Ali Khamenei is now 81-years old. While his health remains a closely guarded secret, his past medical history, age, and the deaths in recent years of other senior leaders have led Iranians to start considering what a post-Khamenei Islamic Republic might look like. There are two main contenders to succeed Khamenei: his 51-year-old son, Mojtaba, and Judiciary Chief Ebrahim Raisi.