The gospels of Matthew and Luke in the New Testament describe Mary as a virgin (Greek: παρθένος, parthénos) and Christians believe that she conceived her son while a virgin by the Holy Spirit. This took place when she was already betrothed to Joseph and was awaiting the concluding rite of marriage, the formal home-taking ceremony. She married Joseph and accompanied him to Bethlehem, where Jesus was born. According to ancient Jewish custom, Mary could have been betrothed at about 12, however, there is no direct evidence of Mary's age at betrothal or in pregnancy. The term "betrothal" is an awkward translation of kiddushin; according to the Jewish law those called "betrothed" were actually husband and wife.

How old was Mary when she conceived?