The age of Aisha at the time of her marriage to the Prophet is also not mentioned in the Quran.
Hadith literature, supporting this comes from Sunni sources. However, these accounts are not universally accepted, and other scholars question their reliability.
Within Islam there are multiple branches and schools of thought. These include Sunnis, Shias, Ibadis, and the Nation of Islam amongst them. Each branch has its own unique perspective on theology, jurisprudence, and historical interpretation.