What's confusing you?

it's not confusing, it's just silly, the Iron Age ended over 2000 years ago, so there were just no ages between the birth of Christ and LK-99?

None which are generally accepted by historians that happen to be named after a single substance:

https://en.wikipedia.org/wiki/Three-age_system

That's only for prehistory.

In any case it's a pretty silly contrivance, how about the oil age? or the silicon age? Both of those are likely to remain more impactful than the LK-99 age, in the event that it does turn out to be an ambient temp/pressure superconductor.

If replicated, those are gonna be footnotes to LK-99 and its likely many derivatives and close cousins.

It’s cringe, dude.

Dude, you're now in the LK-99 Age. Learn to live with it.