Answer:
They have found that their slower rate of aging is due mostly to genetics.
Explanation:
Studies have already established the connections between ageing and genetics, since genetics help identify the underlying mechanisms that govern ageing. Genome studies have identified loci that influence age-related diseases, as well as other important human ageing traits, lifespan included. It is the hope of several in the scientific community that such discoveries will, in the future, allow for anti-ageing interventions.