there is no straight answer to this question, and if you think that is silly i can give you a variety of questions where there is no straight answer. Questions that even the "great Naomi" wouldn't be able to answer.
First of all, youre the one who always goes on about how times are changing, and that happened ages ago, back then there were different views on marriage. Also he was the prophet and was seen as special. of course you would make fun of this but to be honest naomi i dont really care right now because that is your problem, not mine. Also look at how many people in the world do this. The majority, the vast majority do not and if you asked them they would not anticipate on doing it, but as usual like everything else the media will pick up the minority to just make themselves a "good story" when in fact if you looked at it on a larger scale marriage as young as this rarely happens. Again you may say you know people who do, i dont care as all im focused on is answering your question, not playing childish games and trying to make the others seem like fools which you do. you may not admit it but you do. Also yes, in some countries they do it more than others however that is mainly tradition, culture and custom and if you asked them they may seem normal about it, some of the girls might laugh at how late people in Britain get married. Not everyone follows Britains rules and not everyone has to think that British rules are the only rules that are correct. bare in mind i am British, i was born here so im not poking fun.
I will not give a straight answer and to be honest i do not care how much you try to make me or any other religious person on here whose views oppose yours or are different as i have answered the question already. If you want to waste your time trying to get an answer that is right according to your beliefs than by all means keep trying. However my answer is clear. I would not do it, or marry a nine year old or marry a nine year old off in my family however that doesnt mean it does not happen and in some countries it may be considered normal. yes if it goes against there will or against law in the country than yes, it is wrong. I WOULD NOT DO IT HOWEVER. That is my answer. (bare in mind i put it in capitals so it is clear to you naomi what my answer is. we wouldnt want you getting confused again would we?)