[Lotrelf]

I find this passage very fascinating from The Silmarillion.

In those days Elves and Men were of like stature and strength of body, but the Elves had greater wisdom, and skill, and beauty; and those who had dwelt in Valinor and looked upon the Powers as much surpassed the Dark Elves in these things as they in turn surpassed the people of mortal race. Only to the realm of Doriath, whose queen Melian was of the kindred of Valar, did the Sindar come near to match the Calaquendi of the Blessed Realm.
Immortal were the Elves, and their wisdom waxed from age to age, and no sickness nor pestilence brought death to them. Their bodies indeed were of the stuff of Earth, and could be destroyed; and in those days they were more like to the bodies of Men, since they had not so long been inhabited by the fire of their spirit, which consumes them from within in the courses of time. But Men were more frail, more easily slain by weapon or mischance, and less easily healed; subject to sickness and many ills; and they grew old and died.

I think this sums up all.