No.
At that time in history, childhood was very short because the average lifespan was very short.
'We often say that Mohammad was a pedophile, but wasn't the virgin Mary around 12 when she was impregnated'
You, not 'we' brought this equivalency between Mohammed's MHR pedophilia with a 9 yr old 'wife' and compared it to the Virgin birth of Jesus by coming up with a young age for Mary. You have said some inane things before, but even for an 18 yr old Deist from NYC this is a bit much for us cornshuckers in the sticks. You really need to retract this abominable statement.
'because the average lifespan was very short.'
Like Abraham's life?