The opposite of r-selection is K-selection, in which you have fewer offspring, more of which survive. K-selected species tend to have larger bodies and longer lifespans. Humans, whales, elephants, and several bird species are among the most strongly K-selected animals.
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The "good" news is that evidence is accumulating all over the place that aging rates respond to evolutionary incentives. Any knob that Evolution can turn, Man can in principle learn to turn.
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"Lower metabolic rate" seems like a plausible explanation for why extreme caloric restriction seems to increase lifespan.
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