Check the trilogy again, it sounds like you missed some details

In that same chapter of Lord of the Rings you see him set up Faramir as Prince of Ithilien, settle the new peace with the men of Harad and the East, free the slaves of Mordor, and renew his vow of Alliance with Eomer. In the appendices, there is mention of Gondor and Rohan on the war-path in later years, defending the West against new threats to the south and east. It also states there that he visits the North-kingdom and his friends in the Shire. The appendices also give the Tale of Aragorn and Arwen, telling of how he passed from life 120 years after the War of the Ring, and stating that his son Eldarion succeeded him.

That sketches the big picture in, at least. There isn't anything in UT or the Sil. Check out the appendices again.

---

   He used often to say there was only one TORn; that it was like a great river: its springs were at every doorstep, and every path was its tributary. “It’s a dangerous business, Frodo, starting a new topic,” he used to say. “You post it on the board, and if you don’t keep your feet, there is no knowing where you might be swept off to. Do you realize that this is the very site that's read by Ph. D's and 70% women, by non-book viewers and purists, gamers, newbies and lurkers, and that if you let it, it might take you to furious arguments, fluffy hugs, virtual cocktail hours or even further and to worse places?”