Hey usgunner, if you'll be so kind as to read this reply (it's kind of long) hopefully I will be able to show you that Aisha was not 9 when the Prophet consummated his relationship with her:

The main source of Islam is the Qur'an, while the secondary source is the hadith (sayings of the Prophet). The definition of a hadith is a saying or an act or tacit approval or criticism ascribed either validly or invalidly to the Islamic prophet Muhammad. If so, then none of the quotes that mention Aisha's age at the time of marriage are actual hadiths. The quotes that mention Aisha's age are 1, 2, 3, 4, 5, 6, 7.

For something to qualify as a hadith, that is a saying of the Prophet Muhammad, then it must have been said by the Prophet. The quotes that mention Aisha's age were not attributed to the Prophet. Five of them were presumably said by Aisha herself, one by Hisham's father and one by Ursa. To be clear, they were not transmitted by these people from the Prophet, they were the opinions of the aforementioned people only. Therefore, they were reports and not ahadeeth. Therefore, they are not accorded the same amount of reverence as the actual sayings of the Prophet. Moreover, there are problems with the authenticity of thezd reports, and you can learn more about that here

In addition, according to Ibn Kathir, Al-Dhahabi and Ibn Hajar Asqalani (who are the most famous Islamic scholars) Asma (who is Aisha's half-sister) was 10 years older than Aisha. Also according to these scholars, Asma died at the age of 100 in 695 CE. This would make her birthdate in 595 CE and consequently Aisha's birthdate in 605 CE.

The Year of Sorrow happened in either 619 or 623 CE, when Khadija (the Prophet's first wife who was 15 years older than him and to whom the Prophet remained monagamous to for 25 years, until her death) passed away. The Prophet married Aisha shortly after this time. This would therefore make Aisha either 14 when the marriage was written and 17 at consummation, or 18 when the marriage was written and 21 at consummation.

Here is more evidence to show that Aisha couldn't have been 9 at the time of marriage:

~ Ibn Hisham’s version of Ibn Ishaq’s Sirat Rashul Allah, the earliest surviving biography of Muhammad, records Aisha as having converted to Islam before Umar ibn al-Khattab, during the first few years of Islam around 610 CE. In order to accept Islam she must have been walking and talking, hence at least three years of age, which would make her at least fifteen in 622 CE

~Tabari reports that Abu Bakr wished to spare Aisha the discomforts of a journey to Ethiopia soon after 615 CE, and tried to bring forward her marriage to Mutam’s son. Mutam refused because Abu Bakr had converted to Islam, but if Aisha was already of marriageable age in 615 CE, she must have been older than nine in 622 CE.

~Tabari also reports that Abu Bakr’s four children were all born during the Jahiliyyah (Pre-Islam Period), which has ended in 610 CE, making Aisha at least twelve in 622 CE.

~According to the generally accepted tradition, Aisha was born about eight years before Hijrah (Migration to Medina). However, according to another narrative in Bukhari (Kitaab al-Tafseer) Aisha is reported to have said that at the time Surah Al-Qamar, the 54th chapter of the Qur’an , was revealed, “I was a young girl”. The 54th Surah of the Qur’an was revealed nine years before Hijrah. According to this tradition, Aisha had not only been born before the revelation of the referred Surah, but was actually a young girl, not even only an infant at that time. So if this age is assumed to be 7 to 14 years, then her age at the time of marriage would be 14 to 21.

I'm sorry my reply is so long and I hope you find it useful! :)