Science has found that antioxidants, for one, can combat age-related illnesses like heart disease and some cancers. Nature has supplied us with a galaxy's worth of these molecules in the form of delicious, whole foods foods like berries, garlic and many others.
http://www.huffingtonpost.com/entry/17-foods-that-can-help-you-live-longer_us_55d62f22e4b055a6dab37773