The idea of an ageless Jesus is still hard to grasp for people who live in the here and now: how much harder would it have been for the Jews who saw Him in person?
John 8:57-59 The people said, ‘You aren’t even fifty years old. How can you say you have seen Abraham?’ Jesus answered, ‘I tell you the truth, before Abraham was even born, I am!’ At that point they picked up stones to throw at him. But Jesus was hidden from them and left the Temple.
Their desire to stone Jesus was a natural response to what they would have seen as a blasphemous claim made right in the Temple itself.