During ancient Viking times, Nordmenn would have their girls married off at age 12 and their boys at 14. Now those same Nordics are sitting in their mothers' basements at age 30. What can you do? Cultures change. Allah (swt) didn't say we have to marry girls that young, so we don't. But the greatest man who has ever walked this Earth, Prophet Muhammad (pbuh), did so and so it's a sin for us to take repluse in what he did. If we insult that as "outdated", then what's next? Should we scoff at the Holy Qu'ran itself?