The Longetivity of Hobbits.

[Ivriniel]

Seems to me that the longevity implies something about sinew, will and resistance to evil (of greed). The longevity of Numenorean seems somehow not accidental.

I don't think the longevity to be attributable to environment (nurture). 31 is the age of maturity of hobbit.

It seems also unsurprising suddenly that Hobbit and Dunedain were the two races most implicated in resistance to the Nazgul/Sauronic purpose. The presence of Hobbits seemed 'ordained', 'fated', or that wildcard that Sauron had not anticipated and of the mysterious will of Eru.