John 8:57

Thou art not yet, &c. So that Abraham on his part could have seen Thee, and rejoiced at the sight. Irenæus hence infers that Christ lived fifty years on earth (adv. Hær. ii. 39, 40). But it is the common opinion that He was on earth for only thirty four (and those not complete) years. S. Chrysostom and Euthymius read forty years, but the common reading is fifty. The Jews seem to have been thinking of the jubilee. "Thou hast not reached one jubilee, how then canst Thou say that Thou hast seen Abraham, who lived forty jubilees before?" (So Severus of Antioch in Catena.) But Euthymius thinks that Christ seemed to the Jews, by reason of the maturity of His judgment and the gravity of His bearing, and also from the labours He had undergone in journeying and preaching, to be fifty years old. But you may easily say that the Jews, in order to avoid exception or mistake, put His age much higher than they knew He had attained to.