Yeah (and Ray Hammond is pretty moderate and skeptical). Some , like Aubrey de Grey (Cambridge-educated, so no fool), and Ray Kurzweil, think that within 30 or 40 years (or sooner) we will be able to repair and regenerate the body pretty much indefinitely. People will still die of course, from new Flu pandemics etc, but with stem cell research, nanotech, genomic medicine etc etc life expectency could well leap quite suddenly from 77 to 125 or 150. Even the skeptics seem to think it is possible- they just dispute when it will happen. If you are 20 (and keep yourself in good physical shape) you will live to see some amazing advances in medicine and healthcare and have a very good chance of living well beyond 100. According to people like Kurzweil, a 100 year old in 2050 or 2060 will look like and have the energy of a 40 year old of today. I guess the big danger will be overpopulation. The world is insanely overcrowded now, and looks set to get even more overcrowded. The population of Africa, for example, is exploding and the birth rate is showing no sign of slowing.