Regarding the Context of Hababa Al-Walbiya

The author says: When it is possible for Hababa Walbiya that Allah returns her youth due to the prayer of Imam Ali Ibne Husain عليه السلام when she was 113 years old and she lived for nine months after meeting Imam Ali Reza عليه السلام why is it not possible for Allah to keep the Qaim young and alive? And that He may keep him alive till he would fill the earth with justice and equity as it would be fraught with injustice and tyranny? In addition to this clear authentic traditions have been recorded from the Messenger of Allah صلى الله عليه وعلى آله وسلم and the Holy Imams عليه السلام regarding the Qaim. Our opponents also narrate about Abu Duniya Muammar Maghribi that his name was Ali bin Uthman bin Khattab bin Marra bin Muwayyad. At the time of the passing away of the Holy Prophet صلى الله عليه وعلى آله وسلم his age was around three hundred years. After the Messenger of Allah صلى الله عليه وعلى آله وسلم he served Amirul Momineen Ali Ibne Abi Talib عليه السلام and when the rulers of the time asked him the secret of his long age he said that he had drunk the elixir of life. He remained alive till the age of Muqtadar. Our opponents do not even accept his death. Then why do they deny the long lifespan of the Qaim? [chapter=Report of Muammar al-Maghribi  سياق حديث معمر المغربي