Nobody has yet.
Most scientists agree that the maximum human life span seems to be about 120 years of age. The longest-lived human on record, Frenchwoman Jeanne Calment, died in 1997 at 122 years of age. Other researchers disagree. Genetic manipulation in the lab has generated worms, fruit flies, and mice that live twice as long as their normal peers. These researchers believe that similar genetic tweaking could soon benefit humans as well.