Will Jeanne be a champion forever?

The French lady Jeanne Calment [1875-1997], who lived in Arles, holds the current world record for longevity : 122 years. But old age records are not exactly rocket science, and older contenders may have existed, or continue to exist, for this record.

Jean-Louis Serre, a French professor of genetics, wonders here whether it might be impossible for humans to live any longer than that.