Sorry for the transliteration of arabicArabic names :)
For this reason The prophetthe Prophet (pbuh), tried to marry women from different tribes, even from Bani omayyah to decrease their aggressiveness toward himself, creating love possibly, and better spread of Islam.
The prophet points to the house of Aisha, and repeats this sentence three times: Fitnah is here, Herehere is where the Hizb of Satan will appear.
In conclusion, you should read history unbiased and see what happened and what the consequences were. Aisha was among the other wives of the prophet, which apparently did several mistakes including the well known-known battle of camel. I doubt if anybody can deny that. I am very worried that when I speak about this sensitive issue one of the Sunni brothers gets angry. Nevertheless, the wives of the Prophet are Umm Almuminin, which means that no bodynobody can marry them after the Prophet.
I want to add some text about an issue that came up in the comments of @thecorocodile... answer. Basically the questioner is asking, why GodGod that knows about the future and he is all wise and all knowing, why should he let his Messenger (pbuh) do sth which can be potentially wrong (in this case marriage with Aisha)?
Note that as metionedmentioned in this answer, there were a lot of benefits through the multiple marriages of the Prophet (pbuh). It may only seem wrong because of the things that are mentioned in the question which are true indeed. But this conclusion (wrong decision by Allah) is subjective. Proof needed to support the argument. Sometimes we don't comprehend the reasoning behind things from the beginning. I suggest you read this. It might help alota lot.
PS: For the age of Aisha when she married the Prophet (pbuh), see this atleastat least. neitherNeither 6 nor 9 seems to be true.