And then there is the Gospel of John, which often has surprisingly accurate details not mentioned in the Synoptic Gospels.
One can argue, based on John 2: 20-21, “The Jews said, ‘This temple has been under construction for forty-six years, and you will raise it up in three days?’ But he was speaking about the temple of his body,” and John 8:57, "the Jews said to him, ‘You are not yet fifty years old and you have seen Abraham?’ ” that John sees Jesus as dying age 49 (three years after he was 46, when he is “not yet 50”. That latter phrase would be odd if Jesus were, in fact, about 30.
If we just use this data from John, we get a birth year about 20 BC!
This just points out the difficulties in calculating the exact date. And, as several others have asked, does it really matter? I don’t think so.
A few things:
1.) I think you’re reading too much into the statement about the Temple. In context, the Judaeans are talking of the Temple grounds which is still undergoing construction ( from John’s POV, they were obviously misunderstanding Jesus’ words),
not of Jesus’ actual age.
So the Jews said to him, “What sign do you show us for doing these things?”
Jesus answered them, “Destroy this temple, and in three days I will raise it up.” The Jews then said, “It has taken forty-six years to build this temple, and will you raise it up in three days?”
But he was speaking about the temple of his body. When therefore he was raised from the dead, his disciples remembered that he had said this, and they believed the Scripture and the word that Jesus had spoken.
2.) As for the whole “
you do not yet have fifty years” issue: the main problem here would be that John’s mention is second-hand. In other words, in the context it is posed as more of a rhetorical question by the Judaeans to Jesus rather than, again, a definite statement about Jesus’ actual age.
The Judaeans said to Him, “
Now we have known that you have a demon! Abraham died, and the prophets; and you are saying, ‘If any one may keep my word, he shall never taste of death to the age’. You are not greater than our father Abraham who died, are you? And the prophets died. Whom do you make yourself?" Jesus answered, "If I glorify myself, my glory is nothing. It is my Father who is glorifying me, of whom you say that He is your God; and you have not known Him, and I have known Him. And if I say that I have not known Him, I shall be like you - a liar; but I have known Him, and His word I keep. Abraham your father was glad that he might see my day; and he saw, and rejoiced.”
The Judaeans, therefore, said to Him, “
You do not yet have fifty years, and have you seen Abraham?” Jesus said to them, “
Amen, amen, I say to you, before Abraham was - I am.” They took up, therefore, stones that they may throw at Him, but Jesus hid Himself and went out from the temple.
Again, drawing from my cabinet of stock answers:
The “
fifty years” has been the subject of much speculation. Aside from the ideas that it points to Jesus’ approximate age or that the number was used to symbolize the end of a full working life (all the while knowing that Jesus has not yet completed it), there have also been scholarly theories about how it was a reference to the fifty-year Jubilee period. The Jubilee was the fiftieth year that concluded the cycle of seven “weeks” of seven years in Leviticus 25, when property was returned to the original owners, the farmer was not to sow or reap, and slaves were released. It is also the unit that the
Book of Jubilees (2nd century BC) uses to calculate the age of the patriarchs and in its goal of calendrical reform, hence the title.
It is speculated that Jesus (or John) knew of
Jubilees and was at this point deliberately making a subtle reference to it: “
Abraham your father was glad that he might see my day; and he saw, and rejoiced.” (cf. Jubilees 16:20-31, where Abraham rejoices at the promise of a future exalted seed of Isaac.) The book’s concern for the Sabbath, and the fact that even Abraham did not complete four Jubilees before dying, would make the taunt especially appropriate for Jesus, the Sabbath-breaker who had not yet completed even
one Jubilee. In any case, they argue that John’s apparent disinterest in concrete dates (he mostly prefers to date events by days or festivals), coupled with his interest in the number seven (the seven “
I am” sayings, the seven discourses or the seven
semeia or signs that Jesus performs in this Gospel come to mind), makes it more likely in their opinion that the number fifty was used symbolically rather than indicating the actual age of Jesus.
3.) John explicitly speaks only of three Passovers within his Gospel: Jesus’ ministry begins and ends in one, which in a literal reading would put us in a period of more or less
two years. The popular idea that Jesus preached for three (or to be more exact,
three and a half) years comes not from the Gospels, but from a patristic (Origen and Eusebius of Caesarea) interpretation of Daniel’s prophecy of the Seventy Weeks (9:24-27), specifically the passage: “
And he shall make a strong covenant with many for one week, and for half of the week he shall put an end to sacrifice and offering.”