The tradeoff between reproduction and aging is sometimes present and sometimes absent. The successes are over-reported and the failures under-reported, so you

The tradeoff between reproduction and aging is sometimes present and sometimes absent. The successes are over-reported and the failures under-reported, so you might get the impression of "extremely well documented" with a cursory reading. Here is an example from Cynthia Kenyon's lab, "Healthy Animals with Extreme Longevity" http://www.sciencemag.org/content/302/5645/611.full http://www.sciencemag.org/content/302/5645/611.full