The phrase "individual genes" refers to specific sections of DNA that carry the instructions for making specific traits or characteristics in living organisms, like eye color or height. Each gene has its own specific function. Full definition
The first genetic clues for slowing aging emerged from animal models in which the effect of individual genes on average life spans could be tested. (scientificamerican.com)
At first they could not determine more than six bases in the replica DNA, which did not provide enough unique addresses to identify individual genes in the human genome. (sciencedaily.com)
Understanding how individual genes affect lifespan opens new ways to control the aging process and the occurrence of aging - related diseases. (sciencedaily.com)