The scientists seem to have known the reason why women tend to live longer than men.

In a recent study published in Scientific American, Professor Thomas Kirkwood, director of the Institute for Ageing and Health in Newcastle, England revealed that genetically, men are more easily exhausted than women.

Before this, people think that manita live longer because men generally experience more severe stress at work than women. However, this is not proven because the woman is now also doing the same job as men. While the life expectancy gap on average between the two remain distant.

Another theory, women will live longer because they do not tend to have bad habits such as drinking, smoking, or often eat unhealthy food. This theory is also not proven because even though women live longer, but when it's older than men, on average a lower level of their health while at the same age.

Women or females of other species also proved to have relatively longer life than males. Then, what makes a woman or female more longevity than men or male?

As quoted from Physorg, 12 November 2010, from the research conducted, it is known that female rats have a greater ability in correcting the cell body than male rats. However, this changed when the mice ovaries removed.

Something similar occurs in male rats. Castrated male rats have a longer life than male rats genitals equipment remains incomplete.

Kirkwood also found evidence of a mental hospital in Kansas in which the act of castration had become commonplace to help patients. From the evidence collected, on average, a castrated male aged 14 years longer than normal men.

"Women need more healthy body because their bodies have a more important role when raising their offspring," says Kirkwood. "Men do not have a role so that the cells of their bodies has nothing to do with longer life," he said.

Kirkwood mentioned, testosterone levels also seem to affect short-age men. So, if you're a man, become a mighty man is not the key to your longevity.

Although theory has made can not be called accurate in absolute terms, but Kirkwood believes that the above reasons are the biological explanation makes the most sense why women outlive