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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.
Adult development encompasses the changes that occur in biological and psychological domains of human life from the end of adolescence until the end of one's life. Changes occur at the cellular level and are partially explained by biological theories of adult development and aging. [1]
In humans, ageing represents the accumulation of changes in a human being over time and can encompass physical, psychological, and social changes. [3] [4] Reaction time, for example, may slow with age, while memories and general knowledge typically increase.
The sexual revolution describes a change in attitudes and actions regarding sex in Western cultures. It came to a head in the early 1960s, leading to emerging adulthood as a stage. This was due to young adults having sexual relations or children before marriage. [46] While it came to a head in the 1960s, the sexual revolution started long before.
There has yet to be a distinct link between the two because it is hard to determine exactly how each aspect of aging effects the memory and aging process. However, it is known that the brain shrinks with age due to the expansion of ventricles causing there to be little room in the head. Unfortunately, it is hard to provide a solid link between ...
The discovery was a revolutionary breakthrough in aging research, demonstrating that the aging process could be controlled in the laboratory, and sparked more research into the molecular biology of aging. [59] [60] 1995 Method for detection of senescent cells using a cytochemical assay. [61] 1997 The absolute record for the duration of human life.
Intrinsic mortality is defined as mortality due to ageing, the physiological decline due to innate processes, whereas extrinsic mortality is the result of environmental factors such as for example predation, starvation, accidents and others. Flying animals such as bats, for example, have fewer predators, and therefore have a low extrinsic ...
Due to the various changes experienced throughout life, humans and animals have to regularly learn how to adjust to their environment. Throughout our lives, we encounter various phases that demand continuous adjustment, from changes in career paths and evolving relationships to the physical and psychological shifts associated with aging.