Jay Fox is blogging more regularly once more. The first part - the introduction - to an essay on the mathematics of physical immortality is up at Longevity First: "Living longer, even just a few years, could mean the difference between having access to a breakthrough medical treatment that will add 10-20 years to your life, or not having access to it. And that 10-20 years could be the difference between having access to the next big breakthrough, adding even more decades to your life ... In other words, losing 20 pounds and exercising three times a week could be all it takes [aside from advances in medicine] to add 30 or 50 years to your lifespan. In fact, if medical progress is fast enough, losing those 20 pounds could be the difference between living to 65 or living to 165, or even 1,065." Staying ahead of the curve of medical advances is also known as actuarial escape velocity.

Link: http://longevityfirst.org/archives/2006/01/the_mathematics_of_immortality_i_introdu.html