Neither. Biochemistry is ridiculously complicated and things like this tend to be taken WAY out of context by the media and wishful thinkers.
I have not yet seen anything making the claim you've made, so I'd appreciate a citation. That said, from what I gather, tests on using resveratrol for life extension have had mixed results at best.
Wikipedia:
The groups of Howitz and Sinclair reported in 2003 in the journal Nature that resveratrol significantly extends the lifespan of the yeast Saccharomyces cerevisiae.[3] Later studies conducted by Sinclair showed that resveratrol also prolongs the lifespan of the worm Caenorhabditis elegans and the fruit fly Drosophila melanogaster.[4] In 2007, a different group of researchers was able to reproduce Sinclair's results with Caenorhabditis elegans,[5] but a third group could not achieve consistent increases in lifespan of D. melanogaster or C. elegans.[6]
In 2006, Italian scientists obtained the first positive result of resveratrol supplementation in a vertebrate. Using a short-lived fish, Nothobranchius furzeri, with a median life span of nine weeks, they found that a maximal dose of resveratrol increased the median lifespan by 56%. Compared with the control fish at nine weeks, that is by the end of the latter's life, the fish supplemented with resveratrol showed significantly higher general swimming activity and better learning to avoid an unpleasant stimulus. The authors noted a slight increase of mortality in young fish caused by resveratrol and hypothesized that it is its weak toxic action that stimulated the defense mechanisms and resulted in the life span extension.[7]
http://en.wikipedia.org/wiki/Resveratrol#Life_extension