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The DNA damage theory of aging postulates that DNA damage is ubiquitous in the biological world and is the primary cause of ageing. [27] The theory is based on the idea that ageing occurs over time due to the damage of the DNA.
Genetic theories of aging propose that aging is programmed within each individual's genes. According to this theory, genes dictate cellular longevity. Programmed cell death, or apoptosis , is determined by a "biological clock" via genetic information in the nucleus of the cell.
The metabolic stability theory of aging suggests it is the cells ability to maintain stable concentration of ROS which is the primary determinant of lifespan. [37] This theory criticizes the free radical theory because it ignores that ROS are specific signalling molecules which are necessary for maintaining normal cell functions. [37]
Pages in category "Theories of biological ageing" The following 30 pages are in this category, out of 30 total. ... Aging theories based on evolvability;
Biological aging explained "Chronological age is what the calendar tells us," Elissa Epel, PhD, a professor in the department of psychiatry & behavioral sciences at the University of California ...
Senescence (/ s ɪ ˈ n ɛ s ə n s /) or biological aging is the gradual deterioration of functional characteristics in living organisms. Whole organism senescence involves an increase in death rates or a decrease in fecundity with increasing age, at least in the later part of an organism's life cycle.
Pages in category "Evolutionary theories of biological ageing" The following 8 pages are in this category, out of 8 total. This list may not reflect recent changes .
Aging is characterized by a progressive loss of physiological integrity, leading to impaired function and increased vulnerability to death. The hallmarks of aging are the types of biochemical changes that occur in all organisms that experience biological aging and lead to a progressive loss of physiological integrity, impaired function and, eventually, death.