Latest research shows that Gilbert's syndrome can extend life expectancy by approximately 10%. The reason is that bilirubin has been determined as a super antioxidant.
As we age our cells replicate and it has been proven that with each cellar division of your cells, each division shortens your telomere lengths. Longer telomeres in Gilbert's Syndrome patients holds true to the antioxidant effects of bilirubin, that protect the ends of the telomeres, extending their life, and thus that of the individual.
Research has indicated lower vascular, heart, and other problems, along with greater resistance to disease and cancer, may extend the syndrome carriers (approx 3-5% of the population) lives by around 10%.