An X chromosome is possible "secret" of greater female life, because it contains many genes related to the brain and is crucial for survival.
The report presented by the University of California San Francisco (UCSF) belongs to the second X chromosome that women have in relation to men, the possible cause of living longer and other physiological benefits.
The Y chromosome of the man has few brain genes and it is not necessary to survive, said the study.
In contrast to the biological wealth given by the female X chromosome, only the masculine Y "contains a few genes different from those that create secondary sexual properties such as male genitals and facial hair and it's not necessary for survival, says the publication.
"We can imagine that nature has led women to develop in this way, and when you live longer you can make sure your offspring are chosen and possibly their offspring," says researcher Dena Dubal, professor of neurology at UCSF and author's main study, published today in the scientific journal Aging Cell.