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The theory is based on the idea that ageing occurs over time due to the damage of the DNA. As an example, studies of mammalian brain and muscle have shown that DNA repair capability is relatively high during early development when cells are dividing mitotically, but declines substantially as cells enter the post-mitotic state. [28] [29] [30]
So far, empirical research from a life course perspective has not resulted in the development of a formal theory. [8] Glen Elder theorized the life course as based on five key principles: life-span development, human agency, historical time and geographic place, timing of decisions, and linked lives. As a concept, a life course is defined as "a ...
Ecosystems forming a global ecological network- Networks within our ecosystems show us that we should be very concerned about the aging of our habitat. [5] Elements of human systems- The aging process can be portrayed through human conceptual, cultural, and technological networks. With time, each of these networks begin to decline. [5]
Ageing (or aging in American English) is the process of becoming older.The term refers mainly to humans, many other animals, and fungi, whereas for example, bacteria, perennial plants and some simple animals are potentially biologically immortal. [1]
These are examples of how the free-radical theory of aging has been used to neatly "explain" the origin of many chronic diseases. [24] Free radicals that are thought to be involved in the process of aging include superoxide and nitric oxide. [25]
Socioemotional selectivity theory (SST; developed by Stanford psychologist Laura L. Carstensen) is a life-span theory of motivation. The theory maintains that as time horizons shrink, as they typically do with age, people become increasingly selective, investing greater resources in emotionally meaningful goals and activities.
The theory considers the lifelong accumulation of developmental additions and subtractions, with the relative proportion of gains to losses diminishing over an individual's lifetime. [14] According to this theory, life span development has multiple trajectories (positive, negative, stable) and causes (biological, psychological, social, and ...
According to this theory, which was developed beginning in the 1960s by Derek Price and Robert Merton and elaborated on by several researchers such as Dale Dannefer, [34] inequalities have a tendency to become more pronounced throughout the aging process. A paradigm of this theory can be expressed in the adage "the rich get richer and the poor ...