Antioxidants are the secret to keeping plastics together. If you've ever owned polypropylene sportswear, you know it lasts forever until the first wash. Wash out the antioxidant package and the polymer turns brittle and to dust.
The human antioxidant package is Vitamin C (water) and Vitamin E (oil). Beta-carotene is a free radical trap, but you don't want it flooding your body. About 500 mg of C and 400 IU of E, eaten after dinner every day past puberty for your whole life, is a really good idea barring medical counterindications (e.g., oxalate kidney stones).
Oxygen metabolism is reactive and toxic. Breeding to boost endogeneous levels of superoxide dismutase, catalase, and other enzymes protective against aerobic metabolism byproducts is remarkably effective at prolonging the lives of short-live mammals.
Turn on general somatic telomerase, add dietary C and E, mop up after toxic aerobic metabolism, and you're in business to be around more than a century no sweat. Will there be anything around you worth living for when you arrive?
