Imam al-Zaman (a) was born in 255/869 about 12 centuries ago. This longevity is not comparable to that of ordinary people. Shiite theologians have provided different replies to questions about the extraordinary longevity of Imam al-Zaman (a), Shiite theologians.

Empirical Responses
Biologists take it possible for human beings to live long lives. Lutf Allah Safi Gulpayigani has cited many western scientists who have claimed that, biologically speaking, a human organism can live 800 to 1000 years.

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Philosophical Responses
Possibility of Occurrence Miracle: Imam al-Zaman's (a) long life is a miracle and an extraordinary event.
With the Divine Will, a human person can have a long or permanent life.The human soul is in control of the body. If the soul is so powerful that it can have wilaya on the body, in addition to the control, then it can keep the body alive for a longer time.According to the Qur'an, the prophet 'Uzayr's food and drink stayed fresh after 100 years although the food and drink do not have souls. Thus, a fortiori a human person with a soul can have an extraordinarily long life.According to historical accounts, there were people who lived longer lives than other people.

Scriptures
The Torah, the Gospel, and the Qur'an have pointed to people who had longer lives than ordinary people. According to the Qur'an, Noah's mission as a prophet lasted for 950 years. It also mentions people with long lives in earlier nations.

Hadiths
Some hadiths have also pointed to the long life of Imam al-Zaman (a). For example, there is a hadith from Imam al-Sajjad (a) according to which: "our Qa'im bears traditions from the prophets. His tradition from Adam and Noah is his long life." Imam al-Sadiq (a) has also assimilated Imam al-Zaman (a) to Ibrahim (a) who lived for 120 years, but was like a 30-year-old young man. According to a hadith from Imam al-Hasan (a), "God will give a long life to the ninth child from my brother Husayn's progeny. And then with His power, he will reappear as a young man looking younger than 40 years."

End of Life
After his uprising in Akhir al-Zaman, Imam al-Zaman (a) will rule the world. According to hadiths, the period of his reign is from 7 to 303 years. In most of the Sunni hadiths, the period is 7 years, and in Shiite hadiths, it is mostly over 10 years. According to some Shiite hadiths, his reign will be 7 years with each year being equal to 10 or 20 years. According to other hadiths, the length of the reign depends on the Divine Will, and so it is not known. The most popular view among the Shi'as is 19 years.
There is no hadith about how Imam al-Zaman (a) will die or be martyred. Some scholars appeal to the well-known view that all the Imams (a) are martyred (based on a hadith according to which, "all of us will either be killed or poisoned", and thus, argue that Imam al-Zaman (a) will be martyred at the end of his government.