What will you do after your fifth retirement?

According to a Duke University researcher, there is no natural limit on human life expectancy.

The lifespans of people in developed nations are increasing at a remarkably constant rate, suggesting that there is no natural limit on life expectancy, said a Duke University researcher in an article in the May 10, 2002, Science. Data analyzed by the scientists indicate that the maximum human lifespan will reach 100 in about six decades . . .

The researchers say that while there may be a limit to how far life expectancy can rise, it is clear that such a limit is not imminent.