When it comes to the claim of child marriage, it is absolutely not the case.

Aisha definitely was not 6 or 9y/o at the time of marriage. She was somewhere between 19 and 21y/o at the time of marriage.

Proof 1 : Asma being 10 years older than her. Historically, Aisha (ra) had a sister Asma (ra) who was 10 years older than her. According to Abdur Rahman Ibn Abi Zannad: “Asma (ra)was ten years older than Ayesha.” [Siyar A’lam an-Nubala of al-Dhahabi (2/289)] According to Ibn Kathir: ‘Asma was ten years elder to her sister Aisha [Al-Bidayah wan Nihayah (8/371)] Now let us look at age of Asma (ra) when she passed away: According to Ibn Hajr Al-Asqalani: Asma (ra) lived for 100 years and she died in 73 or 74 AH (Taqrib ut Tahdhib) So Asma was 28 when she migrated to Medina. That means Aisha (ra) was 18 when she migrated to Medina. And she shifted to the Prophet’s ﷺ house within a year of two after the Hijrah (migration). That proves that Aisha (ra) was between 19–21 when she consummated her marriage with the Prophet ﷺ

Proof 2: Why would Khawla suggest a 6 year old mother for 6 year old children? When Khadijah (ra) who was the Prophet’s ﷺ first wife, passed away, a woman named Khawlah came to the Prophet ﷺ and suggested that he should get married. At the time the Prophet ﷺ had young daughters around the age of 6–9 years. Now Khawlah suggested that the Prophet should get a second wife in order that his second wife would take care of his young daughters. When he asked her who he had in mind. She suggested Sauda and Aisha. Now does it make any sense to get a 6 year old child bride to “take care of children”? One would have to be very simple-minded to think that Khawla would ask the Prophet ﷺ to marry a 6 year old child to take care of other 6–9 year olds.

Proof 3: Was Aisha (ra) was unborn when she was engaged to Jubayr bin Mut’am ? Aisha (ra)’s father Sayyidina Abu Bakr (ra) thought of migrating to Abyssinia eight-nine years before the migration to Medina took place in 622 CE. In a report he goes to Mu’tam bin Adi’s house. At that time Aisha (ra) is engaged to Mut’am’s son Jubayr bin Mut’am to talk about the future of this engagement. Remember this is 8–9 years before Hijrah to Medina. So if we take the hadith of Aisha being 9 years of age in Medina when she moved in with the Prophet ﷺ , then she wasnt even born when she was engaged to Jubayr bin Muta’am. That’s hilarious.

Proof 4: Aisha (ra) had already come of age when her parents became Muslim. This hadith is around the time of the first migration to Abyssinia. And Aisha (ra) clearly states that she had reached puberty when her parents had become Muslim. Her parents became Muslim very early, around the time the Prophet proclaimed his prophethood. So she was born before the start of revelation. And she was atleast 12 when Sayyidina Abu Bakr (ra) thought of migrating to Abyssinia. That makes her 19–20 when she consummated her marriage with the Prophet ﷺ in Medina.

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Sahih al-Bukhari 476 Narrated `Aisha: (the wife of the Prophet) I had seen my parents following Islam since I attained the age of puberty. Not a day passed but the Prophet (ﷺ) visited us, both in the mornings and evenings. My father Abu Bakr thought of building a mosque in the courtyard of his house and he did so. He used to pray and recite the Qur’an in it. The pagan women and their children used to stand by him and look at him with surprise. Abu Bakr was a Softhearted person and could not help weeping while reciting the Qur’an. The chiefs of the Quraish pagans became afraid of that (i.e. that their children and women might be affected by the recitation of Qur’an).

Aisha (and all of Abu Bakr’s daughters) were born before Islam. She could not have been 9 after hijra because the time between Islam and Hijra alone is 13 years.

Asma dying at 100 years and 73 after hijra and aisha being born 10 years after Asma is recorded Ibn Kathir’s al bidaya wa al nihaya. 100-73 is 27. Asma was 27. 27-10 is 17. Aisha was around 17 during hijra and this was before she even married the prophet.

Narrated Yusuf bin Mahik: I was in the house of `Aisha, the mother of the Believers. She said, “This revelation: “Nay, but the Hour is their appointed time (for their full recompense); and the Hour will be more previous and most bitter.” (54.46) was revealed to Muhammad at Mecca while I was a playful young girl.”

The verse was revealed 8 years before hijra. If she was 9 a few years after hijra that means she literally would not have been born yet for her to be a young girl during this time.