[markomalley]

So how old was Mary when "God" impregnated her?

It isn't stated anywhere, to my knowledge. However, we know that she was betrothed to Joseph at the time and that would require her to have been at least 12.5 years old at the time of the betrothal. So in all likelihood, she'd have been around 13.

[peyton randolph]

So in all likelihood, she'd have been around 13.

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An old maid by Mohammed's standards. We know of at least one 6 year old that he married.