SAN DIEGO, Calif. - Growing old is an inevitable fate for humans, but researchers at the University of California San Diego may be one step closer to being able to delay the aging process.In an article published in the journal Science on July 17, molecular biologists and bioengineers describe how they isolated two separate paths that cells travel during aging and engineered a novel way to genetically program the paths for a longer lifespan.The group of scientists studied aging in yeast cells to understand if different cells age at the same rate and for the same reason.They discovered that cells of the same genetic material and within the same environment can age in “strikingly different ways.” Using microfluids, computer modeling and other.