The headline of this article is a bit misleading: scientists did not make mice age backwards. What they DID do, by manipulating an enzyme called telemorase long thought to have a role in aging, was to turn declining, feeble mice into more energetic, healthy, seemingly younger animals. While the genomes of these mice had been manipulated to make them highly suitable for the experiment, the implications for slowing deterioration in humans - either in specific organs or the entire body - are very real. Practical human applications may be decades off, though.
COMMENT: At age 51, it's really annoying that all kinds of advances that could have prolonged my productive life may not be ready until shortly after I'm dead. I'm excited for my kids, though!