For the first time in the world, based on systems analysis, mathematical interpretations and models, as well as on the generalization of more than a hundred different theories of aging existing in world science, the Systems Theory of Aging (STA) has been developed, where aging is defined as a decrease in human viability with age. The Systems Theory of Aging allows us to generalize and organize known concepts about the mechanisms of aging in the form of a hierarchical scheme, starting with the fundamental cause of aging, defining three global mechanisms of aging and ending with specific mechanisms and manifestations of aging