That's retarded. You can't apply logical rules to a fictional race of people! Every fantasy author interprets the logistics of elves differently. In the Forgotten Realms universe, for instance, elves do have pointed ears, have frail waif-like body structures, and live about six times longer than humans. And it's not like Tolkien invented elves either. They were originally depicted as michievous imps, and let's not forget that whole Christmas thing.