Khaberni - Scientists have long been puzzled by a seemingly simple question: Why do women live longer than men? A new comprehensive study that followed hundreds of living species confirms that the difference is not just luck, but a deeply rooted biological law since the dawn of life on Earth.
This leads us to what researchers have found in the genetic structure of each sex.
Female mammals carry two X chromosomes that provide them with an extra layer of protection against mutations, whereas males have one X and one Y, thus much less protection. Interestingly, the opposite happens in the world of birds, where males generally live longer than females, confirming that the issue is related to chromosomes and not just behavior.
This clearly delineates the line between genetic makeup and the daily lifestyle of each species.
According to new research published in the journal *Science Advances*, in mammals, males tend to engage in violent competition for mates, which accelerates aging and depletes energy, while females in monogamous bird species share roles and live longer lives.
From here, it is clear that motherhood and childcare have played a significant role in cementing the longer life expectancy of females, as the survival of the mother also means the survival of the offspring.
Thus, this female superiority extends from elephants to humans, and from forests to modern cities. Even today, women continue to live longer on average than men in most countries around the world.
While habits may change and healthcare may improve, it appears that nature still preserves a biological secret that has made their lifespans longer… for millions of years.
