Then said the Jews unto him, Thou art not yet fifty years old, and hast thou seen Abraham?
Then said the Jews unto him, Thou art not yet fifty years old. No inference, as Alford properly says, can he drawn from this as to our Lord's age as man at that time. Fifty years was, with the Jews, the term of ripe manhood, and at that age the Levites ceased to officiate.
And hast thou seen Abraham? He had not said He saw Abraham, but that Abraham saw Him, as being Abraham's special privilege. They, however, give the opposite turn to it - "Hast thou seen Abraham?" - as an honour which it was insufferable for him to pretend to.