Scientists hope their research could explain why some people develop conditions that affect pigmentation in the body, including the skin disorder vitiligo.
The oldest person of all time was Jeanne Louise Calment from France who lived to 122 years and 264 days between 1875 and 1997.
"When I saw some of the cells in the culture dish rejuvenating I couldn't believe it. These old cells were looking like young cells. It was like magic."