Third Age! I want more!

[EllethValatari]

Okay, so everyone who has looked at a hardcover ROTK book knows what it says in the back about the third age. But is there anything else, that either Christopher or John wrote, about the 3rd age? What happens after Aragorn is king?...etc?

[Valandil]

After Aragorn becomes King, and the Ringbearers pass into the West along with the Elven Rings... is actually the Fourth Age.

We know a little from the LOTR Appendices. Beyond that, JRRT tried writing a story but abandoned it - and made a few other statements here and there.