It took him almost 30 years to finish the whole history of Middle-Earth. Therefore some basics about this mystical place. The humans There is the human race of course. The humans live brief lives and die of old age. The Hobbits are playing quite an important part in the stories of Tolkien.
Hobbits are much shorter than humans.
Even shorter than dwarfs. They live for about 100-120 years. Hobbits love comfort. Their favourite activity is eating. Adventures are by far too exhausting for them.