However, the question of what causes aging is still not well understood, even by experts, and is currently a major research topic for researchers studying these issues.
One of the theories proposed by a group of researchers is the "wear-and-tear" theory. According to this theory, the cells of the human body and the tissues in which many of these cells are gathered together function as a source of energy, and this source of energy gradually diminishes as we age, which may be the cause of aging.
This is one possible explanation, but it is not yet known whether it is correct or not.