How old was Mary when Jesus was born?

[BartholomewB]

As I already pointed out to @Vico, the point at issue here is only the vow of lifelong virginity. Is there any evidence of an established practice of that kind in Second Temple Judaism? If there was, I think it would be a well-known fact, not the kind of secret information that we have to hunt for.

 

[Dan_Defender]

the vow of lifelong virginity

I agree there is no evidence of this among Jews of the Old Covenant.