Aging refers to the gradual process of physical, psychological, and social changes that occur over time in an organism, particularly in humans. It encompasses the biological, genetic, and environmental influences that lead to a decline in physiological functions and an increased likelihood of age-related diseases as an individual grows older. Aging is characterized by various changes, such as reduced elasticity of the skin, slower metabolism, weakened immune response, and cognitive decline.
In a broader sense, aging can also refer to the passage of time and the cumulative effects of life experiences and exposure to environmental factors. The concept of aging is often explored through different lenses, including biological aging (the physical and biological changes), psychological aging (changes in cognition and emotional well-being), and social aging (how society perceives and treats older individuals).
Aging is a universal phenomenon that affects all living organisms, and it raises important questions regarding health care, quality of life, and the social implications of an aging population. Scientists study aging to better understand the mechanisms behind it and to find ways to promote healthier aging processes and extend lifespan.