"It’s important to mention that scholars have various opinions on the age of ‘Aisha. ‘Aisha herself says in a hadith that she was 6 when she got married and 9 when she moved into the home of the Prophet ﷺ. We also know through hadith that when she moved into the house of the Prophet ﷺ, she was past the age of puberty. While we trust ‘Aisha’s word on many matters, her self-reported age comes into question for several reasons. One of those reasons is the fact that at this time, as in several cultures, many did not calculate their age or know their exact birthday. Other issues that make scholars question ‘Aisha’s self-reported age are beyond the scope of this paper. But, because of that information, some scholars calculate that she was closer to 15 or even 19."
YOUR source