Personally, I like the definition expressed by King (1988) : Aging is
defined as a genetic physiological process associated with morphological
and functional changes in cellular and extracellular components
aggravated by injury troughout life and resulting in a progressive
imbalance of the control regulatory systems of the organism, including
hormonal, autocrine, neuroendocrine and immune homeostatic mechanisms.
King, D.W. (1988) Pathology and aging. In: Kent, B. & Butler, R. (Eds),
Human Aging Research : concepts and techniques, pp.325 - 340, New York,
NY: Raven Press.
