The 61-year-old American, who has predicted new technologies arriving before, says our understanding of genes and computer technology is accelerating at an incredible rate.
He says theoretically, at the rate our understanding is increasing, nanotechnologies capable of replacing many of our vital organs could be available in 20 years time.
Kurzweil calls his theory the Law of Accelerating Returns. Writing in The Sun, Mr Kurzweil said: “I and many other scientists now believe that in around 20 years we will have the means to reprogramme our bodies’ stone-age software so we can halt, then reverse, ageing. Then nanotechnology will let us live for ever.
“Ultimately, nanobots will replace blood cells and do their work thousands of times more effectively.
“Within 25 years we will be able to do an Olympic sprint for 15 minutes without taking a breath, or go scuba-diving for four hours without oxygen.