The longstanding Ave Vigoda status page is down, presumably from all the people just wanting to see the status change from alive to dead.
I always figured the cause of his notoriety for being alive was hat the guy looked 100 when he was 50. But the cool thing was that he had a pretty good sense of humor about it. We associate him with Fish and Sal Tessio, neither of which had much of a sense of humor. Abe always looked happy as could be out in the real world, and certainly seemed amused enough by the occasional rumors of his death.