http://blog.wired.com/defense/2009/03/darpa-muscle-re.html

The first phase of the Pentagon's plan to regrow soldiers' limbs is complete; scientists managed to turn human skin into the equivalent of a blastema — a mass of undifferentiated cells that can develop into new body parts. Now, researchers are on to phase two: turning that cellular glop into a square inch of honest-to-goodness muscle tissue.

This brings to mind Aubry deGrey’s prophecy:

I expect many people alive today to live to 1000 years of age and to avoid age-related health problems even at that age.