At a lab in [Harvard University],
old, blind mice have regained their [eyesight], developed smarter, younger [brains] and built healthier [muscle] and [kidney tissue].

The experiments, by Dr. David Sinclair, show aging is a reversible process...
                                                                Our bodies hold a backup copy of our youth that can be triggered to regenerate...

It doesn't matter if the body is
50 or 75, healthy or wracked with disease, "the body will then
remember how to regenerate and will be young again, even if you're already old and have an illness.

"The cells go back to between
50% and 75% of the original age, and they stop and don't get any younger.

How the cells know how to do that, we don't yet understand."