] Dolly's birth six-and-a-half years' ago caused a
] sensation around the world. But as many sheep live to
] twice this age, her death will refuel the intense debate
] over the health and life expectancy of cloned animals.

I think its interesting that Dolly died at age six. I wonder if that correlates at all to the fact that she was cloned from a cell taken from a six-year old sheep.

New Scientist