Generally speaking, female centenarians is 5 times more than male centenarians. Why? Scientists concluded five main factors that contribute to this phenomenon.

1. There are repair genes on X chromosome and female have two X chromosomes so that female could have more active repair genes available.

2. Female hormones can better stimulate immune system for repairing nervous system.

3. The physiological cycle of female is better at getting rid of toxic chemical and stimulating hematopoietic functionality.

4. Female have relatively less stress from work and society.

5. Female tend to cry more and this is good for getting rid of toxic material from the body.

6. Female tend to talk more and this is good for releasing stress and tension.