It is our firm belief that Imam Mahdi (as) is the Proof of Allah upon the earth in this era. It is also our belief that Allah, by His Infinite Grace and Mercy, has granted him a long life. This belief is doubted by people who do not believe in it by questioning its validity and saying that such a belief is unscientific. The purpose of this article is not to establish the long life of Imam Mahdi...