Kurzweil's Quest For Eternal Youth Sets Group Abuzz

At MIT last week, Kurzweil described a future in which he's convinced immortality -- or a drastically longer life span -- will be possible thanks to emerging technologies. His new book, which will hit stores in a few weeks, outlines a special "longevity program" of diet, exercise and nutritional supplements aimed at slowing the aging process.

He and Grossman recommend simple starches and foods low in sugar and high in anti-inflammatory agents such as fish and nuts. They advise taking all sorts of substances such as phosphatidylcholine, a cell-membrane component that people tend to lose as they age, making their skin sag.

In an interview, Kurzweil said he and Grossman also have developed their own line of products and will launch a Web site to sell them, including shake mixes and other meal-replacement products .

Such dietary supplements tend to be controversial in the medical community. David Schardt, senior nutritionist at the nonprofit Center for Science in the Public Interest in Washington, said the only regimen that has shown real potential to slow aging to date is drastically reducing calorie intake.

"We tell people to take these claims with a grain of salt because in many instances there is no evidence -- or the evidence is far from conclusive -- that these supplements will do anything," Schardt said.

Kurzweil acknowledged that science today can't halt aging, but he said he believes science will develop age-defying or even age-reversing techniques within 10 to 20 years, thanks to advances in biotechnology and nanotechnology.

He described three stages or "bridges" on the purported road to immortality. First is his healthy living program designed to correct "metabolic imbalances" and keep people alive long enough to benefit from the second stage. In stage two, a decade or so away, he contends biotechnology advances will block diseases and slow aging, because the decoding of our genome is already leading to tissue-engineering techniques for regrowing cells and organs, and to the creation of genetically targeted drugs and gene therapies.

These techniques, he said, should help some people reach the third stage -- about 30 years away -- when nanotechnology will allow humans to radically rebuild and extend their bodies with help from "nanobots," itsy-bitsy robots smaller than human blood cells that will slip into our bloodstreams to fix DNA errors, fight pathogens and expand intelligence.

At that point, he declared, humans may be able to live forever.

Some are skeptical. S. Jay Olshansky, an epidemiology professor at the University of Illinois School of Public Health, called Kurzweil's vision "science fiction" in a phone interview. He said life expectancy isn't likely to change much even after the expected medical advances. "Life expectancy is inching up. It's not jumping up."