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.
Mr Kurzweil adds that although his claims may seem far-fetched, artificial pancreases and neural implants are already available.
Mr 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.
Wow, another jewish scientist predicting utopia!
Of course, if technology progresses as fast as he says it will, then there is really no need to worry about things like global warming. We can just launch some nanobots into the atmosphere and let them do their thing, while we rest our immortal behinds in the shade.
Instead, if people will live forever, it might get a little crowded, so maybe immigration should be immediately halted, no?
But at any rate "futurists" have a piss poor track record. In the early 20th century many claimed wars to be a thing of the past.
And weren't we all suppose to be using flying cars by now?