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handoflixue comments on If calorie restriction works in humans, should we have observed it already? - Less Wrong
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Chronopause has a three-part article discussing the science of diet as a life extending tool.
Part 1 Part 2 Part 3
Part 2 and 3 both touch lightly on the calorie restriction aspect of certain diets, and it doe seem to have benefits, but it looks like the majority of the actual applies-to-humans science primarily concerns composition of the whole diet, not simply calorie restriction.
The whole thing is definitely worth a read, since it provides a very good foundation for understanding the actual science behind the question :)
From Part 1:
No, it isn't.
Downvoted - What is it, then? Just objecting doesn't provide me any useful information :(
Example taken and adapted from Wikipedia: in a stationary population where 51% of people die at the age of 5 and 49% dies at the age of 70, the life expectancy at birth (defined in the sentence immediately before the [2]) is 36 years 10 months, whereas the median lifespan is 5 years. Life expectancy is the “same as mean, or average lifespan” in stationary populations no matter how skewed the distribution of death ages is -- the reason why it isn't in real populations is that mortality rates change with time.