True. But what that means is that as the temp is higher the "indefinite" life span begins to shorten. And the "shortening" process is only occurring during the periods of increased temps. IOW, where I am, it is 3-4 months a year. So, while mine may not be indefinite, it is still going to be pretty long.
And while it is interesting in an academic sense to talk about 15-20 years, realistically after say 5 years, there are so many other variables to screw you, I really think it is pointless for a middle aged adult to be looking any further down the road than that.
If we descend into a level of chaos which requires that level of self sufficiency for more than 5 years, you better worry a lot more about disease, illness, accident or getting shot by someone, than feeding yourself.
Most people don't think about how they will get needed medications for extended periods. Many don't realize the longer term implications of going off medications that they take for granted. My heart arrhythmia will not affect my life span, but if I stop taking the meds, my odds for heart attack and stroke go way up. I maintain a 2 year supply of the meds, much past that is difficult because of age degradation. In a SHTF scenario, do you think I devote much concern to more than 5 years down the road?
Very good point. And if it gets that bad, "displacement" begins to look like a realistic scenario -- put away the AK and the shotgun, and start relying on the silver and gold stash to escape to e.g. the Antipodes. If it goes to hell here, Ascension Island, Kerguelen, and Christmas Island all begin to sound pretty good, and Christchurch (with my 400 very distant relatives) starts to sound like Paradise.
Most people don't think about how they will get needed medications for extended periods.
Now there's a thought. Outlaw smuggler and drug mule for pack-trains loaded up with Tenormin, Capoten, and generic ACT inhibitors? Hot loads of knockoff Actos and Zyban? Who knew Obozo's lockup of Stateside medical care ("Medical care is the keystone of the arch of Soviet power" -- V.I. Lenin) would open up vistas of opportunity and the possibility of living flush like a Medellin drug lord for enterprising American conservatives?
Getting rich while getting well and subverting Communism. What a thought. Maybe I'll have a late-life opportunity to learn to fly ancient C-123's and Beech Barons and operate a Hughes chain gun. Thanks, amigo!