At which point it becomes obvious that the eligibility age should rise with increasing lifespans.
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Delong has thus recommended that the eligibility age for social security should rise along with lifespans.
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But this is not the same as slowing down ageing itself, and thus increasing maximum lifespans.
Biologists have known for decades that feeding animals near-starvation diets can boost their lifespans dramatically.
But to invest in mines with decades-long lifespans, mining firms want enduring tax and regulatory regimes.
Best Buy treats televisions somewhat differently because they are more expensive and have longer lifespans than portable gadgets.
LEDs are competitive in heavy use settings where their longer lifespans and a minor energy edge pay off.
Given longer expected lifespans, new retirees can anticipate spending more money during the retirement years than previous generations.
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The advances in medical tech that led to longer lifespans also cost more.
From a mixture of those who had shorter and longer lifespans to those always predisposed to a shorter lifespan.
Despite future medical advances that promise to lengthen lifespans and improve quality of life for seniors, but at a price.
For that reason, since heart failure is the main cause of death in such mice, their lifespans were not extended.
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Even though Japanese lifespans continue to lengthen, the country simply will not have enough young people to maintain its population.
Experiments on mice have shown that eating significantly less food can extend lifespans, so long as the food is highly nutritious.
To see if this was true, Dr Allman and his colleagues gathered data on the lifespans of ten primates, including man.
As is indeed happening in countries around the world as lifespans lengthen.
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Unfortunately, American civilization has also devised a stunning number of mechanisms to extend the lifespans of ailing financial institutions and brain-dead corporate entities.
It is possible (and I emphasise, only possible) that those left in that group now are those who always had the shorter lifespans.
Over this period, they will release as much as nine times more energy than they did during their brief lifespans inside a conventional reactor.
Boosting the activity of sirtuins in yeast, nematode worms and fruitflies (three rapidly reproducing stalwarts of biological laboratories) does indeed result in longer lifespans.
Which leaves those private costs, those exploding livers, shortened lifespans and unfortunate romantic entanglements that occur as a result of the consumption of booze.
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While some of this increase reflects cars with improved lifespans, it also reflects the impact of the recession and pent-up demand to replace older cars.
Indeed, girls' greater success in school could soon become one of those "unshakable" truths that we come to see as natural -- like women's longer lifespans.
And they say that with continued improvements in these areas, particularly medical technology, there is every reason to suggest lifespans will continue to edge upwards past 110.
Add awesomely long lifespans to the benefits ledger for LEDs.
Health provision, one reason for longer lifespans, is highly regarded.
Imagine a world with unlimited food, water, and energy in which we prevent disease rather than cure it and in which our lifespans increase along with our wisdom and knowledge.
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It may, indeed, be possible to reduce or eliminate particular age-related diseases, and that would increase average lifespans in the way that eliminating other diseases has done in the past.
Over the past two decades, both household and national savings rates have declined sharply in the rich world, even as lengthening lifespans have added new risks to retirement (see chart).
But it is possible, at least, that this decline of lifespans in certain areas, and increasing gap in age at death, is explained purely and solely by migration of the elderly.
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