@Magigi, @robinhood and those who care to know.
1. First of all, do not rely on propaganda, from the haters. Where was coloured camera in the 6th century to take that photo (just joking).
2. Secondly, it is not 6 but it's 9.
3. For those who were taught Biology or have read medical science, nowadays a lady reaches maturity i.e. adulthood at age of approx 12-15, we have seen even 9 year old. And the age factor of puperty changes depending upon the athmosphere, surroundng, climate, or diet.
4. Scientist say that closer to the equator, the age of puberty is earlier.
And nowadays because of change in athmospehere, surrounding or diet, there are cases in which girls at the age of 10 they reach puberty.
5. Also medical science tell us that if any lady starts mensuration cycle at the age of 10, there is nothing unique.
It is quite common. Even 9, there is nothing to be alarmed of. However, they say if the mensuration is below the age of 9, then there is a concern.
So based on these scientific facts that we have come to learn in the 20th century, according to Islamic Sharia, when a lady reaches puberty and a man reaches puberty, they can marry.
6. Every country has its own law
For example some countries say that when a girl reaches the age of 18, they can marry (Kenya, India). Some say age of 16 (US).
So if a couple get married in US at age 16, it's legal. But in Kenya it's illegal.
So why has Kenya chosen 18 and US 16, you don't know.
And there is state called Texas, where it's common to marry early. So in Texas alone, even if the girl or boy is age 14, they can marry and it's legal.
7. So you realize that everyone has his own criteria.
As far as Islmaic criteria is concerned, as I told you, that once a girl reaches puberty and a boy reaches puberty, then they get mature, then they can marry.
So based on this, what we realize about Aisha, she was unique. And when we read her life history, she was very intelligent, she was very matured, and because of that we know that many Hadiths were narrated by her.
There are some people, who say, "but fine, she could have waited another 10 years then get married!" Some of those modern people.
So I feel medically, scientifically, and Islamically a marriage can be consumated at the age 9 once a lady is mature.