After reading Tolkien´s work over and over, I think I discovered the first flaw Ever in the Lotr compilation. Well, that is why I think feedback from people like you is required, for you are peers to me in this journey:
It is said, and clearly depicted in The Return of the King (even in the movie) that Bilbo´s age caught up with him after departing from the One Ring. In his Years of having obtained it in March of the year 2941 and leaving it to Frodo on the night of the Long Expected Party, on his eleventy-one birthday, Sept. 22, 3001, Sixty years had passed. So, after delaying that 60 years burden, those years wore heavilly on Bilbo, who, when he left over the seas on 3021, had barely the strenght to talk. No problem there, I hope you follow me still.
Now, the Ring was found in the River Isen on the year 2463 and came to Smeagol that same day. If Gollum parted from the One Ring in the year 2941, he had it for 478 years. 478 that should catch up with him the same way as with Bilbo. Probably even worse. By March 25, 3019 whe he fell after fighting Frodo for the Ring, 78 years had passed. This means that not only Gollum had to be 78 years older than when he lost the Ring. That ammount of years alone is tiresome. Now add those 478 years of catching up..! He shouldn´t have been able to walk, least run and escape from Aragorn, the Elves, Gandalf, and Morgoth himself.
Thinking this throughly, I came to the question of state of mind, but Gollum is as much a Hobbit as Bilbo. And eating raw fish and young Goblins surely doesn´t prolong life.
So, there. I dropped it on your laps now. Forgive me if there is a mistake, I am hazy on the dates.
Namärie!Quel marth mellonamin,
Merin sa haryallë alassë!