Please note the following:

1. Imam Mahdi, peace be upon him, according to the rule ﴿إِنَّمَا أَنَا بَشَرٌ مِثْلُكُمْ﴾[1]; “I am only a human being like you,” is physically like a human being like other people and thus affected by natural effects, just as the Messenger of Allah, peace and blessings of Allah be upon him and his family, and the Prophets before him were affected by them, to the extent that the wife of Ibrahim, peace be upon him, said: ﴿يَا وَيْلَتَى أَأَلِدُ وَأَنَا عَجُوزٌ وَهَذَا بَعْلِي شَيْخًا ۖ إِنَّ هَذَا لَشَيْءٌ عَجِيبٌ﴾[2]; “Woe to me! Shall I give birth to a child while I am an old woman and my husband is an old man?! This is surely a strange thing,” and the brothers of Yusuf, peace be upon him, said: ﴿يَا أَيُّهَا الْعَزِيزُ إِنَّ لَهُ أَبًا شَيْخًا كَبِيرًا﴾[3]; “O noble chief! He has a very aged father,” and Zakariyya, peace be upon him, said: ﴿رَبِّ إِنِّي وَهَنَ الْعَظْمُ مِنِّي وَاشْتَعَلَ الرَّأْسُ شَيْبًا﴾[4]; “O Lord! Indeed, my bones have weakened and my head has turned hoary with age,” and said: ﴿رَبِّ أَنَّى يَكُونُ لِي غُلَامٌ وَكَانَتِ امْرَأَتِي عَاقِرًا وَقَدْ بَلَغْتُ مِنَ الْكِبَرِ عِتِيًّا﴾[5]; “O Lord! How can I have a son when my wife is barren and I have reached infirm old age?!” Yes, Imam Mahdi, peace be upon him, must be strong to carry out the affairs of leadership when he comes, and there are narrations from the Ahl al-Bayt indicating that he will appear in the form of a young man despite his old age; as it has been narrated from Hasan ibn Ali, peace be upon them, that he said: «يُطِيلُ اللَّهُ عُمُرَهُ فِي غَيْبَتِهِ، ثُمَّ يُظْهِرُهُ بِقُدْرَتِهِ فِي صُورَةِ شَابٍّ دُونَ أَرْبَعِينَ سَنَةً، ذَلِكَ لِيُعْلَمَ أَنَّ اللَّهَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ»[6]; “Allah prolongs his life in his absence. He then will have him appear by His power as a young man under the age of forty,” and from Ja‘far ibn Muhammad, peace be upon them, that said: «لَوْ قَدْ قَامَ الْقَائِمُ لَأَنْكَرَهُ النَّاسُ، لِأَنَّهُ يَرْجِعُ إِلَيْهِمْ شَابًّا مُوَفَّقًا، لَا يَثْبُتُ عَلَيْهِ إِلَّا مَنْ قَدْ أَخَذَ اللَّهُ مِيثَاقَهُ فِي الذَّرِّ الْأَوَّلِ»[7]; “When Qa’im (i.e., the Mahdi) rises, people deny him; because he returns to them as a healthy young man. Only those with whom Allah has made a covenant on the Day of Alast stand firm in belief in him,” and he said in another narration: «وَإِنَّ مِنْ أَعْظَمِ الْبَلِيَّةِ أَنْ يَخْرُجَ إِلَيْهِمْ صَاحِبُهُمْ شَابًّا وَهُمْ يَحْسَبُونَهُ شَيْخًا كَبِيرًا»[8]; “And one of the greatest trials is that their owner comes to them as a young man, while they consider him to be an old man,” and he said in another narration: «يَغِيبُ غَيْبَةً فِي الدَّهْرِ وَيَظْهَرُ فِي صُورَةِ شَابٍّ مُوَفَّقٍ ابْنِ اثْنَيْ وَثَلَاثِينَ سَنَةً، حَتَّى تَرْجِعَ عَنْهُ طَائِفَةٌ مِنَ النَّاسِ، يَمْلَأُ الْأَرْضَ قِسْطًا وَعَدْلًا كَمَا مُلِئَتْ ظُلْمًا وَجَوْرًا»[9]; “He disappears for a long time and appears as a healthy young man at the age of thirty two until a group of people turn away from him. He fills the earth with justice and equity as it has been filled with oppression and cruelty,” and it has been narrated from Ali ibn Musa, peace be upon them, that he said: «إِنَّ الْقَائِمَ هُوَ الَّذِي إِذَا خَرَجَ كَانَ فِي سِنِّ الشُّيُوخِ وَمَنْظَرِ الشُّبَّانِ، قَوِيًّا فِي بَدَنِهِ حَتَّى لَوْ مَدَّ يَدَهُ إِلَى أَعْظَمِ شَجَرَةٍ عَلَى وَجْهِ الْأَرْضِ لَقَلَعَهَا، وَلَوْ صَاحَ بَيْنَ الْجِبَالِ لَتَدَكْدَكَتْ صُخُورُهَا»[10]; “Qa’im is the one who, when he comes, will be of the age of elders and with the appearance of youth. He is so powerful that if he extends his hand toward the biggest tree on the earth, he will uproot it, and if he shouts between the mountains, their rocks will crumble,” and he said in another narration: «عَلَامَتُهُ أَنْ يَكُونَ شَيْخَ السِّنِّ، شَابَّ الْمَنْظَرِ، حَتَّى أَنَّ النَّاظِرَ إِلَيْهِ لَيَحْسَبُهُ ابْنَ أَرْبَعِينَ سَنَةً أَوْ دُونَهَا، وَإِنَّ مِنْ عَلَامَاتِهِ أَلَّا يَهْرَمُ بِمُرُورِ الْأَيَّامِ وَاللَّيَالِي حَتَّى يَأْتِيَهُ أَجَلُهُ»[11]; “His sign is that he is old in terms of age and young in terms of appearance, to the extent that those who look at him assume him to be forty years old or younger, and one of his signs is that he does not become decrepit with the passing of days and nights until his appointed time comes.” However, these narrations, if true, do not contradict the fact that he is a human being like other people; because an old person too can look young if he has a good character, a moderate temperament, a strong body, and pure sustenance. Moreover, this may be an honor to him and a sign from Allah Almighty; as it has been narrated that Amr ibn Ḥamiq al-Khuza‘i gave water to the Prophet, peace and blessings of Allah be upon him and his family. So he said: «اللَّهُمَّ مَتِّعْهُ بِشَبَابِهِ»; “O Allah! Let him enjoy his youth.” Then eighty years of his life passed, and not a single strand of his hair turned white[12]. In any case, there is no doubt that Imam Mahdi, peace be upon him, will be strong enough to carry out the affairs of leadership when he comes, whether in the form of a young man or an old man, ﴿وَاللَّهُ عَلَى كُلِّ شَيْءٍ قَدِيرٌ﴾[13]; “and Allah has power over all things.”

2. The marriage of Imam Mahdi, peace be upon him, is possible rationally and religiously, but it is not proved. Therefore, there is no point in discussing it.

3. The marriage of Imam Mahdi, peace be upon him, to a girl from Tehran is merely a claim with no evidence for it. It is unlikely that a Muslim scholar has made such a claim, and if he has done so, he has gone wrong. It is expected that you should rely on certain and undisputed reports and not pay attention to conjectural and illusory reports; because conjectural and illusory reports have no validity and are examples of superstitions and rumors.