Did early Christians believe that Mary was a teenager?

On Nov. 13, a fifth Alabama woman came forward to accuse Roy Moore, former judge and current GOP Senate candidate, of sexual assault when she was 16. Condemnation of Moore has been widespread, but Moore himself vehemently denies these allegations. He has backing from many in Alabama. 

One of his most controversial statements of support came from Alabama State Auditor Jim Ziegler, who declared: “there’s nothing immoral or illegal here…Maybe just a little unusual.” Ziegler went on to appeal to the Christian story of Mary and Joseph:

“Take Joseph and Mary. Mary was a teenager and Joseph was an adult carpenter. They became parents of Jesus.”

I find the allegations against Moore repulsive. But, in addition, as a scholar of early Christianity, Ziegler’s remarks took my breath away. As most Christians would know, an important tenet of Christian theology is that Jesus was born of a virgin mother.