The Longetivity of Hobbits.

[Inziladun]

Originally Posted by Mithadan

Hobbits are described as a branch of the human race that had gone entirely unnoticed by the "great" until the Third Age. Letter no. 131. So it could not be said that they were involved in any of the great events of the First Age (a certain RPG to the contrary). However, Bilbo is later described as having been "selected by the authority and Gandalf" (because he was abnormal) and they were "ordained individuals inspired and guided by an Emissary." Letter no. 281.

As you say, it can only be speculation, but maybe Hobbits were allotted a greater span to afford them a decent sized population, in order to provide for a greater selection from which a "suitable" individual could be chosen as Ring-bearer.
If so, that seems a bit calculating on behalf on the race's "maker", though it certainly does not seem to have caused any distress to them.

On a tangential note, it's really amazing that Gollum the Stoor was able to live to such an advanced age with the help of the Ring. Was that too a product of his innate longevity?