No Cap On Life Expectancy?

Samarkind writes "An article over at Science Daily (no registration req'd) talks about the average life expectancy for people going up all over the world by an average of 3 months per year. They also say that the somewhat pervasive idea that people can only live so long just isn't true. The kicker that I got from the article was that the average life expectancy for men is 65... isn't that about when I'll retire?" Remember the life expectancy includes all the people who die at age 2 or 15 or 21. If you make it past 25 or so, you've got good odds to make it to 80.

Comments

Re:Something seems off here...

[nucal]

Exactly - from the article: The researchers emphasize they are not saying there is no limit to the rise in life expectancy. "There may or may not be some limit at some advanced age -- it is impossible to tell given current empirical data and theoretical knowledge," added Vaupel. "What is clear is that there is no limit that we are about to bump up against."

In other words we're a long way from reaching the limit to life span - which is important for policy makers and actuaries. But, this does not mean that there is no limit to life span, in the absence of other interventions. In fact, life span has a significant genetic component which has been studied in a lot of different organsms, like fruit files and worms where lifespan is controlled by the daf gene family.

In the worm case, it's not the accumulated insults of living that cause death, instead it's like throwing a switch. Alter the switch and you alter life span without changing quality of life. What causes the daf genes to get activated is still not well understood, but it might relate to the timing of having progeny ... after the worms reproduce they tend to die off, while mutant long lived worms tend to put off reproduction. Here are some labs working in aging research)