The concept of dating is one of the most widely remarked upon and questioned aspects of a Christian walk.
It was truly by His hand that such a marriage took place.
God chose the specific man and the specific woman for the call of the Kingdom in marriage.
There is not a specific appropriate age given in the Bible, rather, a season.
Mary was more than likely in her early teens when she became engaged to Joseph, whereas Isaac was more than likely in his 40s.
She was to be his companion but work alongside her husband in complete harmony.
This is why she was made of Adam’s rib in particular. Each rib has a mate, just as Adam was given his mate, Eve.
The curse of the Fall did not negate the intention set in place by the Lord to extend an offer of relationship toward mankind between humans and himself; nor did it negate the creation of male-female relationships in the harmony of marriage.
The Bible has much to say about the progression of relationships.
Adam walked with God in the Garden, had conversations, was loved, and knew his Creator well.