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The two theories; non-adaptive, and adaptive, are used to explain the evolution of senescence, which is the decline in reproduction with age. [8] The non-adaptive theory assumes that the evolutionary deterioration of human age occurs as a result of accumulation of deleterious mutations in the germline. [8]
The immunological theory of aging suggests that the immune system weakens as an organism ages. This makes the organism unable to fight infections and less able to destroy old and neoplastic cells. This leads to aging and will eventually lead to death. This theory of aging was developed by Roy Walford in 1969.
The reliability theory of aging is an attempt to apply the principles of reliability theory to create a mathematical model of senescence. [1] The theory was published in Russian by Leonid A. Gavrilov and Natalia S. Gavrilova as Biologiia prodolzhitelʹnosti zhizni in 1986, and in English translation as The Biology of Life Span: A Quantitative Approach in 1991.
Stage theories typically focus on "age-appropriate" developmental tasks to be achieved at each stage. Erik Erikson and Carl Jung proposed stage theories [2] [3] of human development that encompass the entire life span, and emphasized the potential for positive change very late in life. The concept of adulthood has legal and socio-cultural ...
This work has been important because it clarifies how improvements in life expectancy can be accompanied by deterioration in population health – e.g. the percent of the population with a disability or the prevalence of heart disease [4] Such insights are essential for understanding the implications of changes in technology and health ...
Ageing (or aging in American English) is the process of becoming older until Death. 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 .
Geography of aging or gerontological geography is an emerging field of knowledge of human geography that analyzes the socio-spatial implications of aging of the population from the understanding of the relationships between the physical-social environment and the elderly, at different scales, micro (city, region, country), etc.