Let me begin by saying that I am definitely NOT in favor of pedophilia.
In fact, my ex-wife was sexually molested by her own father repeatedly between the ages of 5 and 6 years old, and I've personally witnessed how she is still majorly psychologically damaged by the same at age 52...even if she doesn't presently recognize it herself (she's recognized it in the past...now I believe that she's hiding behind a wall that's she erected to block those memories out).
Along these same lines, I used to date a woman who was sexually molested by one of her mother's boyfriends at age 4, and she wound up extremely psychologically damaged as well. In her case, she ultimately fell into a life of prostitution for many years until becoming a Christian later on in life. Even as a Christian, the psychological damage is still a major issue.
With these disclaimers out of the way, I also admit that I've often wondered about something FROM GOD'S PERSPECTIVE.
This "something" has to do with a girl's menstrual cycle which normally begins when she's around 12 years old (in some cases, it starts earlier than this), and a boy hitting puberty usually around the same age or even earlier. In other words, it seems that God designed children to be ready for sexual activity at a young age.
Having said this, again, I am definitely NOT in favor of pedophilia or of an adult having sexual relations with a young child.
At the same time, however, I'm just wondering if God didn't originally see fit that young boys and girls could start marrying EACH OTHER at an early age.