Ageing is a complex process that involves a decline in biological functions and is accompanied by psychological, behavioural, and other changes.
All cells experience changes with ageing, becoming larger and less able to divide and multiply. There is an increase in pigments, and vital organs begin to lose some function as we age. Ageing changes occur in all of the body’s cells, tissues, and organs, and these changes affect the functioning of all body systems.
Some systems begin ageing as early as age 30, while other ageing processes are not common until much later in life. Unlike the changes of adolescence, which are predictable to within a few years, each person ages at a unique rate. Some signs of ageing can be seen from the outside, such as wrinkles and grey hair, while others are not visible.