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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.
Such an ageing process may include qualitative and quantitative changes and includes diminished or defective synthesis of collagen and elastin in the dermis. [ citation needed ] Extrinsic ageing of skin is a distinctive declination process caused by external factors, which include ultra-violet radiation, cigarette smoking, air pollution, among ...
Many humans are acutely sensitive to their physical appearance. [1] Some differences in human appearance are genetic, others are the result of age, lifestyle or disease, and many are the result of personal adornment. Some people have linked some differences with ethnicity, such as skeletal shape, prognathism or elongated stride. Different ...
Usually this refers to humans. Since life extension is only pertinent if accompanied by health span extension, and, more importantly, by preserving brain health and cognition, finding rejuvenating approaches that act simultaneously in peripheral tissues and in brain function is a key strategy for development of rejuvenating technology. [1]
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.
Note that somatic mutations are not heritable, they are only a source of developmental variation. Studies done on Drosophila melanogaster have shown that mutation accumulation drives the combination of alleles which have "age-specific additive effects" that cause a decline in stress response and ultimately an age-related decline in fitness. [7]
Other underlying health issues may be seen first in the eyes. Doctors can diagnose a number of conditions just from looking at your eyes . Red spots in the retina, the light-sensitive layer at the ...
This degeneration is caused by systemic changes in the circulation of waste products and the growth of abnormal vessels around the retina causing the photoreceptors not to receive proper images. Though ageing almost always causes this, other possible effects and risk factors include smoking, obesity, family history, and excessive sunlight exposure.