Radio Lab had very interesting stories on keys to extending life.
Take for instance, a rat has 3 year life span while a squirrel has a 30 year life span.
Why? Gene differences.
By crippling particular gene(s) in worms and enhancing the ability of helper genes one scientist was able to extend the life of particular worms from 4 day to 8 days and then to 24 days.
Does that mean humans could possibly live til say, 550 years old in the future?
She is working on a "pill" to stop or slow down the aging process.
http://www.radiolab.org/story/91562-mortality/
http://www.radiolab.org/story/91565-fountains-of-youth/
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