Almost all Muslim countries disallow child marriages - even Saudi. And I've seen the hadith where it was mentioned. It seems to be more of a description than words of encouragement. It's like saying "800 men died in this battle".(Original post by Josb)
It's not an order, but since Muslims are encouraged to follow the guidance of the prophet, it can lead to several problems, considering that the Quran was written in the 7th century and several parts may enter in conflict with our modern standards, such as child marriage and terrorism, which both can be condoned by the Quran and hadiths.
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