There's at least one other draenei who is old enough to remember Argus, a questgiver in Blood Watch (Jessera of Mac'Aree). Given that there's nothing overtly special about him, I guess there are quite a few who do.

But even with a theoretical lifespan that can be measured in dozens of millennia, few would be that old. People die of other causes than old age: violence, accidents, disease. If you assume that 0.1% of the population dies of unnatural causes each year, about 90% will make it to 100. 60% will survive to 500, and 37% to 1,000. 13 out of one trillion will survive until they're 25,000. That's of course assuming that each individual has the same chance of surviving each year, which is probably not true (once you've survived to 1,000, you've probably shown some instinct for self-preservation)

On that note, considering that the Draenei possess such an attunement to the light and healing (Much more advanced than the medical techniques we possess), I'm sure most of the accident-related injuries that would be considered fatal in our society would be nothing more than a quick Gift of the Naaru heal. I mean, c'mon. I can visit Ragnaros in Molten Core and take a car-sized hammer to my face and proceed to beat him to death with my fists. (Takes a while but it works.) I doubt people in the WC universe has much to worry about.

And there's also that weird thing with resurrections and such... But that's outside the subject.