According to the journal Nature, a method to convert adult cells into embryonic stem cells is on the verge of discovery:
Biologists say they are close to finding a cellular elixir of youth: a cocktail of proteins that can convert adult cells into embryonic stem cells that are able to grow replacement tissues.
Assuming this pans out, it means we are very, very close to a stunning new medical technology, whose impact should be as great as the sum of the germ theory of disease, antibiotics, anaesthetics, blood transfusions and x-rays. It would appear that, by the end of the next decade, 21st-Century medicine will be as far advanced over that of the late 20th Century, as 1990s medicine was over that of the 19th Century.