In Mad Mo’s time it was not only legal, but common.
True, I bet your great great great great grandmother was married at a young age too. Don’t mean it’s acceptable today. And we are talking about people today not ancient history. Ancient history doesn’t make it ok today, it just makes it Ancient history for referance and in no way excuses the artist of today. These people in your tv and on your movies are doing this today and we know about it.