John 8:57

57. Fifty years old Thou hast not seen half a century; much less seventeen centuries. From these words Irenaeus inferred that Jesus was near fifty years old. Others have inferred that he seemed prematurely old, either from the marks of enduring sorrow in his features, or from his apparent precocious maturity of mind. He was not yet thirty-three; and the fifty here named is simply an even sum to measure off the intervening centuries.

Seen Abraham Jesus had not said that he had seen Abraham, or that Abraham had seen him, but simply that Abraham had seen his day. They, however, in trying to exaggerate his words into absurdity, really elevate them into a higher truth. Jesus, as he will soon declare, had seen Abraham.