Fuck their silly mind games of calling political correctness.
But I don't agree that in past centuries, marriage to 9 year olds was a problem. Many cultures did this for practical reasons.
I think it's fair to say that it does not work anywhere in the world today, and any case of it's current practice is a bad thing.
May be you are right. 1000 years ago, a 12-year old boy marrying a 9-year old girl would have been normal (but still, what about a 53-year old marrying a 6-year old girl)? Anyway, right now there is no need for nine year olds to get married, as the life expectancy has risen by many times.