There are times recorded in the gospel narratives where Jesus perpetuates the cultural ignorance of His day concerning reality and even Scripture, and it's also obvious that He rightfully claimed that He Himself marked the end of the evil age, so I wouldn't be surprised if He would have responded with one of the common rabbinical teachings about the age of creation and redefined it around Himself: that (in His day) the cosmos were six thousand years old, and that He was inaugurating the seventh, Sabbatical, final thousand years of human history - the age of the messiah's presence. Of course, that would put us today in the beginning of a ninth millennial "day" if we believed Jesus' words here to have been "scientific" or "literal", but Jesus (in this hypothetical scenario) would have simply been saying that He was the expected messiah, and that the age of the world was but further evidence of that fact. I don't know, just a fun guess; don't be offended or call me a heretic, please.
analyze. synthesize. repeat.
*It is the next chapter of my life, whether I'm ready or not. My time here in these forums has come to its close. I bless you as I go!*