Well There ARE Other Life Expectancy Estimators
In addition to the scial security site:
http://www.socialsecurity.gov/OACT/population/longevity.html
These sites ask for more info:
http://gosset.wharton.upenn.edu/~foster/mortality/perl/CalcForm.html
http://moneycentral.msn.com/investor/calcs/n_expect/main.asp
http://calculator.livingto100.com/calculator
I've found, (at lest for myself), the results vary by only a year or two.
Do you think that locking the other thread might have been intended as a hint?
Hey, jerk. Come back with those words. You took them right out of my mouth!
I'll add http://longevitycalculator.aarp.org/ to the list; at 50, it said my expected lifetime is 76 or so, shortened by 3 years due to (1) being unmarried and (2) not liking my job 
To make this a bit more relevant to AC, how old do you think you'll be when you stop going, and why? Loss of interest, loss of health, can't afford it on retirement income?
I suspect when my eyes, ears, and/or legs go, and/or I can't drive myself anymore (whether due to the first three or something else), I'll stop going; whether I make it past 70 remains to be seen.
Who's the oldest AC attendee?
To make this a bit more relevant to AC, how old do you think you'll be when you stop going, and why? Loss of interest, loss of health, can't afford it on retirement income?
I can't really say when I shall stop going; It would take something catastrophic, either to the nation, to the convention, or to my health to prevent me from at least planning to go.
But to draw on what I have been able to observe about Fandom In General - the Science Fiction, Fantasy, Mystery, Anime, and all the other Fannish pursuits - I think that if you become involved in Fannish Activity before you turn 30, that if you are still involved after the age of about 45 (perhaps earlier), then you are involved For Life.
Marriage and Family may make one drop out, but this will generally be before reaching 30; if unmarried by perhaps 35, if you are still open to the idea of finding a mate, most likely you will meet someone who is either already in the fannish community (of whatever fannish stripe), or displays fannish tendencies.
This has become more apparent to me with each SciFi convention, and even the Furry Conventions; almost no one truly and permanently GAFIAtes. Someone stops attending conventions usually when they are dead; physical handicap is made up for with motorized chairs or wheelchairs. William Tenn was a GOH at LosCon about 5 years or so ago, and needed an oxygen tank and a motorized chair; I think he was still attending conventions until his death this last year. Forry Ackerman only stopped attending LosCon when he could no longer venture out of the Ackermansion (he died this past year). Despite being very infirm, Ray Bradbury attended ComiCon International last year.
I remember, at the last ConFURence held in Burbank, seeing an elderly gentleman prowling through the artshow; he was dressed in a "hall cosume" as Han Solo from StarWars, with perfect boots, shirt, vest, and gunbelt, with the requisite prop Blaster in the holster (and a damn impressive-looking one at that). He was slender and had a snow-white mane of hair and a moustache, so he could have passed as a 78-year-old version of Han, easily. The man was definitely "fannish", but not particularly "furry" as such, and I had seen him at previous CF's. I asked WalksFar - that's Gary Bell, who was the Artshow Director that year - who he was; turned out to be Kelly Frias, arguably one of the best illustrators of SciFi magazine covers and bookjackets, and also cover illustrator from the Golden Era of the "Slick" magazines: The Saturday Evening Post, Look, Collier's, Atlantic, and The New Yorker. And yes - he saw something in a Furry Artshow which he wanted, bid on, and won.
...And then there is Fred Patten. Fred is very much wheelchair-bound these days, has been for about the last 6 years or so - yet he tries to make weekly meetings of the LASFS on Thursday nights, was attending Saturday C/FO meetings when he coulkd escape the clutches of the Dragon Lady (that's the senior administrator at the fire-trap convalescent hospital at which Fred is currently being held captive resident). With a major effort to meet the conditions for overnight outings which the hospital insists on, Fred has been able to attend CaliFUR and AnimeLA, and LosCon, and the last WorldCon held in Anaheim. And we very nearly pulled off a coup, arranging for him to attend FURther CONfusion 2008, as a last-minute surprise GOH, 400 miles away from the hospital - but that didn't happen. Perhaps the goal was too ambitious, perhaps the complications just became too overwhelming - but in the end, the person who was driving the effort failed to make it come to pass.
Nevertheless - Despite no one seeing him, Fred Patten WAS at AnthroCon, at least in spirit; I understand that a members' badge was made in his name (for which he was quite grateful), as was a nice donation to this year's animal charity.
The Los Angeles Science Fantasy Society has a saying (which they print on their ribbons for members' LosCon Badges) that "Death Does NOT Release You". Perhaps - for TRUE Fans - neither does distance or disability.
GAFIA? All I could get from google was
http://www.urbandictionary.com/define.php?term=GAFAI
Going all Fruedian and Intellectual which doesn't really fit 
Getting Away From It All. Science Fiction fannish usage. It means that the person involved is staying away from fannish activity, such as conventions or fan writing or artwork.
What charlieg said.
People just suddenly stop posting messages or attending meetings or submitting 'tribs to APAs or 'zines, or stop showing up at conventions or as dealers or no longer submit art to artshows or 'zines, sometimes after a public row, sometimes they just seem to...vanish. Sometimes it's because of Fan Politics; sometimes it is because they realise that they are involved in it way too deeply, or they blaze brightly, and burn out. Sometimes they swear that they'll never sully their paws (or eyes) with Furry Fandom ever again. These folks are said to have "Gafiated". Almost always, it is temporary, or when they return, it is to a different level of involvement, with little of the social contact (and pressures)...but almost always, they come back.
AnthroCon - indeed, almost all of the Furry Conventions, here and abroad - work because of the involvement of a relatively few, truly selfless and dedicated fans; and we must never take them or their efforts for granted, nor make the burden which they have so graciously borne and continue to bear, any more stressful or difficult than it needs to be.
Otherwise, GAFIATing can look like a mighty attractive option.
*******
...And as I own a couple of his works, I am ashamed for having mispelled Kelly Freas' (or with the proper respect, Mr. Frank Kelly Freas) name like that.
Thanks; I see now that I transposed the last two letters 
http://en.wikipedia.org/wiki/GAFIA
To further derail this thread, Mark Evanier had a couple of interesting observations in the third and fourth paragraphs from the end of this post; I'll let somebody else quote them (and maybe in a new thread) if they think they're relevant...
On an unrelated note...
You know walksfar? Wow, i hadn't heard of or from him since my newsgroup days. If you see him again, tell him you ran into an olde fruite from alt.fan.dragons.
The oldest AC attendee we've had, as far as I know, was Josie DeCarlo, who is "of a certain age."
Age is meaningless at Anthrocon. I've seen a few greymuzzles that can party hard like the rest of them. 
and then there are young pups like me that don't know the meaning of the word "party"
I am consistently surprised by the dorsai, too. No offense, guys, but some of you look like college professors (particularly PZ myers, actually - it's the beard) and I would have not tagged them for the party animals they are.
Some professors became professors so they could party for the rest of their lives. The only thing that changed from being a student to being a professor was which way the money flowed.
Age is a relative thing... and in my experience age is meaningless.
1. It's not how long you live: it's what you learn in the time that you live. Case in point, why is it that most children know more than their parents when it comes to computers? It's what they grow up with. It's the same reason foreigner children tend to speak better English as their second language than their parents.
2. Senility is the empress of doom, and I think it can happen at any time, though characteristic of old age. I've dealt with people in their 60s who just couldn't think for themselves, and people in their 100s (yes, triple-digit ages) who were very well capable of meaningful, relevant conversation. I, however, tend to act senile from time to time. <.<
3. It's how well one takes care of themselves if all possible. I'm 29 years old. I'm still seen as a child by many, but the day I heard a child call me "old man" at work, I could only stare at her father whom was in front of me and try not to giggle. I have a bad ankle, knee, hip, and back. It hurts to move around without acetaminophen in my system.
Would I really want to live to be 100? Ehhh...
From an interview in the 50s/60s with a woman turning 100:
Reporter: "What's the best thing about turning 100?"
Elderly Woman: "No peer pressure; they're all dead."
Did this warrant two threads?