Obviously, Elves are immortal and do not die of old age. But what of Hobbits, Dwarves, Men, and others? I would like to know the average lifespan of these three main races, along with others you can think of (e.g. Orcs/Goblins, Ents, Wargs, Great Eagles, Mirkwood Spiders).
The very best answer is contained here: LOTR Project: Life Expectancy
This is a quick summary:
Dwarves: 194.5 years Hobbits: 96.84 years Numenorean Men & descendants: 237.2 years Other Men: 81.85 Average for all Men: 163.41