The ageing process is a natural phenomenon that affects all living organisms. In humans, it is marked by physical and mental changes, such as the loss of skin elasticity, the weakening of the immune system, and cognitive decline. However, cultural views on ageing vary greatly, with some societies viewing it as a time of wisdom and respect, while others focus on the physical decline associated with older age.
In scientific terms, "ageing" refers to the accumulation of changes over time that affect the biological functions of living organisms. These changes are influenced by genetic, environmental, and lifestyle factors. As life expectancy increases worldwide, the process of ageing and its implications on health, society, and economics have become increasingly important topics of study.