Scientists are studying the DNA of a woman who was the world's oldest person until her death at the age of 115, in the belief it could contain the secrets to long life. Dutch woman Hendrikje van Andel-Schipper was born in 1890 and became the word's oldest person in May 2004 before her death in August the following year.

What made her even more remarkable was the fact she remained mentally sharp right up until her death. She showed no signs of Alzheimer's disease which most experts assume would be inevitable for someone of her years.

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