How long...

[Letty]

Does anyone know how long Frodo lived?

[A_Brandybuck]

Not really, all what I know is, that he went to Tol Eressea at the Age of 53. Tolkien stated in one of his Letters, that Frodo will die there but he didn't mention an exact point of time or an exact age.

[Rhod the Red]

By wearing the One Ring no doubt his life was extended a few hundred years.

[A_Brandybuck]

How did you come to that meaning? The Ring only stretches the life of someone, when it is in his possession. First, Frodo didn't have the Ring while he was going to Tol Eressea. Second, the Ring was destroyed.

[Rhod the Red]

He possesed it for a long time and used it a few times, the same as with Bilbo.

[Raynor]

I agree with A_B. Also, the coming itself to the blessed realms doesn't prolongue the life span:
Then, even though in Aman, a mortal child would still grow to maturity in some twenty years of the Sun, and the natural span of its life, the period of the cohesion of hroa and fea, would be no more than, say, 100 years.Concerning his actual life span, I think we can only guess.

[ArathorofBarahir]

I have to agree as well. When Frodo went over the sea that didn't extend his lifespan. He went to the Undying Lands to heal the wounds that he had suffered on his journey, and eventually he would die.