Try and look at their lifespans this way; they are all different species, and must age differently then. A dwarf is considered young at 100 and an elf who is immortal has a childhood somewhere in the neighborhood of 50 years, IIRC. Also, a hobbit leads a rather stressless life, maybe that helps out in the aging process. Humans come in all shapes and sizes, and can lead very stressful lives or very dull ones.
Certain variables in the humans life are going to affect how they age and when they die. I think the humans lifespan is the biggest problem in this thread, it is all a gamble with them.
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