This theory postulates that as we age the immune system fails to recognize its own cells and creates autoimmune responses that damage cells and tissues. Cell death results and increased susceptibility to disease may result. Diminished immune function is definitely a feature of aging, but whether it is a cause of aging is still under debate. This theory proposes that the life span of an individual is programmed into their DNA based on the life span the relatives that came before you. Gender and race differences in lifespan also provide some evidence for this theory.
Worldwide women have a longer life expectancy than men.