it's not known but jews made up an age that is supposed to make most whites uncomfortable because they know most people won't check and they seek to spread doubt and steer people away from the lord. it isn't mentioned in the bible to my knowledge and some unverified historical accounts place her birth around 18 years before jesus's birth but the bible is the primary historical document detailing the majority of all modern knowledge about her.  whenever you hear a weird and uncomfortable fact about christianity it's almost always something a jew made up hoping you wouldn't try to fact check them.
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