19. Longevity Genes
Certain gene variants linked to longer lifespans are becoming more prevalent in some human populations. These longevity genes can influence everything from cellular repair to resistance against age-related diseases, providing a survival and reproductive edge.
As people with these variants tend to live longer, they have more opportunities to pass on their genes to future generations. This gradual increase highlights how natural selection continues to shape our genetic makeup—favoring traits that support a healthier, longer life. NIH News