"I'd expected to see slowing down of the clock, but not a reversal," geneticist Steve Horvath said. "That felt kind of futuristic."
Louise Signore of the Bronx says her 102-year-old sister told her "I wish I never got married."
The study doesn't change the fact that smoking is harmful, a scientist stressed.
Lonesome George was arguably the most famous tortoise in the world for being the last of his species.
In a mouse study, their life and health span extended by 10 percent.
"I think the main thing that we are trying to do is improve health, not lifespan. An increase in lifespan could be a nice side effect."
Having high levels of body fat and low muscle mass could pose a double threat to cognitive health, scientists fear.
Exercise boosts immunity and keeps cholesterol low.
The discovery "goes against everything we know in terms of mammalian biology."
"This 'dose' of exercise has become my prescription for life."
Groundbreaking insights are shedding light on this frustrating disease.
We've looked for anti-aging secrets in short-lived organisms from worms to yeast, but the killifish is a vertebrate, making it a much better analog to humans.