The duration of the longevity of Imam Mahdi’s life has been an area of disagreement among several Sunni and Shi‘i scholars. The findings of this research are based on the Qur’anic verses, Shi‘a and Sunni hadith, biological and medical law, and historical documents. These findings reveal that it is possible to live an exceedingly long life, as the Prophet Noah, the Men of the Cave, and Prophet Khidr are among those who have done so. Longevity, with its conditions, is also possible according to biological and medical law, and history has witnessed those who were not prophets
who have lived prolonged lives. Moreover, the longevity of Imam Mahdi is not considered unnatural and opposed to the Holy Qur’an and hadith.
"1. Longevity in the Qur’an The Holy Quran – a text accepted by all Muslims – contains verses that can prove the Shia claim about the possibility of the prolonged lifespan of Imam al-Mahdi (a).
6 Furthermore, Fakhr Razi, a renowned Sunni scholar, considered the medical opinion that human lifespan does not exceed 100 or 120 years in contradiction with the above-mentioned Qur’anic verse; he regarded the great longevity of man as possible only by divine providence.
2. Longevity in hadiths According to narrations in the hadith collections, there existed people who lived a long life before Imam Mahdi.
14 A holy book compiled by Imam Ali (a) inherited to him by Prophet Muhammad (s) 15 Shaikh Saduq, Kamal-u-Din, p.
According to the evidence presented thus far from the Qur’an and hadith which confirm the possibility of man experiencing long life, the question as to whether longevity is a natural phenomenon or if the above-mentioned cases were realized by the infinite power of Allah is worth examining.
Ahmad Amin’s View Ahmad Amin, one of the late Sunni thinkers, criticized the Shi‘a belief in the existence of Imam al-Mahdi (a) and has come to believe that it is God’s practice (sunnah) to limit the human lifespan and that such a practice pertains to prophets as well.
3) Based on the Qur’anic verses, Shi‘a hadith collections, and Sunni sources, there were some prophets and prominent people with an exceptionally long life in this world."