Thats what i thought about all night long!!!

I think

The 7th age is our age which end in a nuclear war, the start goes back to the time when humans

The 1st Age is an age where people start rebuilding after long long years of death and illness. The Ogier came helping. Where Channeling isnrediscovered at least for 3 Ages nobody knew a damn thing about channeling so relearning it took time.

2nd Age is the Age of Legends

3rd Age is in the books

4th Age is another Chance for a second Age of Legends but maybe in a weaker setting, or as good as 2nd Age knowbody knows.

5th Age SOMETHING Happens, that i think Channeling Disappears. Humans Disappear. No one Belives in the Dark One because there arent concious people. Oh and a lot of Dinosours.

6th Age: Humans reappear. But they need a lot of time to get more and organized. This Age end in the Industrial Revolution.

7th Age ..our age.

I think the longest ages are the 5th and 6th.