As with many other issues, the proper age for getting married has a cultural component that the Bible does not specifically override. What constitutes a proper marriage age can vary from culture to culture and still fall within the bounds of scripturally proper conduct. read more
The age is defiend as “when you hit puberty” or “when you have breasts”. So, there is no specific age. Propably intentionally, because marriage to cousins and girls of 6 years was propably not that uncommon in the time. read more
But if any man think that he behaveth himself uncomely toward his virgin, if she pass the flower of her age, and need so require, let him do what he will, he sinneth not: let them marry.