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Well, I'm not sure...
Taking a short look at Appendix D of LotR, it seems to me that the lifespan of the Hobbits of the Shire remained constant over the previous 300 years.
Clearly, their normal lifestyle very similar with that of other Hobbits led to a normal lifespan of 90-100 years. Few Hobbits are exceptions, Bilbo on one side due to the Ring, Lotho on the other because he died of an unnatural death.
So I think it seems pretty obvious that their lifespan didn't increase in the Shire. But as Rhod already mentioned, settling in a fertile area probably did help them live longer.
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“The invisible and the non-existent look very much alike.”
Delos B. McKown
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