Elves in most fantasy settings are long lived. In Tolkien's books they can live forever, never succumbing to old age. However, I am not certain of how things are in warhammer. On one hand, we have some elves who have lived almost since the races beginning, but some also show signs of aging, and all the most ancient ones have magical reasons for living that long.
The armybooks were not much, help being pretty vague. The high elf 8th edition armybook says "Regardless of their bloodline, all elves are long-lived - some say immortal". The dark elf 8th edition armybook is pretty similiar, saying "No matter their alliegance, all elves long-lived to the point of immortality,". We do know that at least one of the phoenix kings died of natural causes, so elves don't live forever.
We have examples of elves aging, most notably Crone Hellebron who shows extreme fraility to the point that her bones can break at a mere stumble, and only is only young a few days a year through the magic of the cauldrons of blood. She was born not too long before the sundering (5570 years before the present). Alith Anar is roughly the same age, but his drive for vengeance has turned him into something supernatural, a ghost of vengeance that will not die until his revenge is fulfilled.
Malekith was born shortly before the vortex was finished, making him around 7000 years old, and Morathi is significantly older. Anethra Helbane was also born before the sundering. All three are users of dark magic though, which is a common source of unnateral lifespan.
So, I my question is, does anyone have any sources about the natural lifespan of elves in warhammer? Also, who are the oldest elves we know of, aside from those already mentioned?