Age Of Aisha R.a.
No amount of details will make anything certain, but if so many accounts are independently saying the same thing, it makes a solid case of it being true. That’s the way history works, unless there is a contrary evidence to reject that. “As in every field of knowledge, most of the time people only critically analyze anything when they find a need to do so.” If this hadith is doubted, ONLY because it is morally an uncomfortable thing in current society, it is not an honest and valid reason. Societal norms keep changing, and as Yasir Qadhi said, this fact being embarrassing can’t be the valid reason to deny it. However, if these hadiths are independently doubted because their isnaad is not satisfactory, it is a different but academic question.