Genetically Altered Mice are the Norm Here.

You figure with all the research on mice these days, it's gonna be The Secret of NIHM everywhere soon enough. The latest batch of wunderkind rodents is bolstering research on free radicals being a major contributor to the aging process. Free radicals are, of course, free-floating molecules with unpaired electrons.

Over at the University of Washington, Peter S. Rabinovitch and his wacky crew cooked up a batch of mice that produced large amounts of the enzyme catalase in the mitochondria. A naturally produced antioxidant, catalase is designed to remove hydrogen peroxide, a common free radical metabolic derivative. The resultant mice lived 20% longer, had healthier hearts, and fewer genetic mutation in their mitochondrial DNA. One important aspect this research illuminates is the reaffirmation that the mitochondria is a major supplier of free radicals within individual cells (Scientific American)

Quick fact about mitochondrial DNA, it's passed on by the mother, yes the mother.

So what does this all mean? Specifically, not much right now, but it's a safe bet that you should keep drinking orange juice.