Jeremiah 4:14
14 O Jerusalem, wash thine heart from wickedness, that thou mayest be saved. How long shall thy vain thoughts lodge within thee?
Sorry, I just don't see it....
It's getting off subject (of the first age) but in this chapter God is warning His children to straighten up and follow Him, "put away thine abominations". If they don't He warns, "My fury come forth like fire...".
In vs. 7 He warns "the lion is come up from his thicket. That was the king of Babylon when he took them captive but he was only a type for the the anti-christ, the destroyer who comes at the 6th trump. He warns us that he will come but He has given many examples of protecting His children. The big "If" attached to that protection is that we know who the fake is and that he comes first.
In vs.13 and 14 He tells us that anti-christ will come and he shows up in Jerusalem. God tells us what He did in the first age, how He shook the earth and split continents apart so by vs.18 we know to be aware of what He did to end the first age and be prepared for the end of the second.
That probably didn't make a great deal of sense to you in such a condensed version but it is much more than telling us about Jerusalem falling to the Babylonians. It is also our warning for end times which He compares to what He did to the first age (23-28).
I find the idea of an age before this one very plausible and it answers some difficult questions. We know we will have an age after this one - why couldn't there have been one before this one?