The progressive incremental transformation in the form and functionality of human beings and animals, that gradually proceed over time. These changes are not due to illness or random accidents or injuries. These transformations in the form and viability of the human or animal body ultimately result in death.
Aging is the gradual cumulative transformations that occur in the human body from birth to death. As human beings age various changes manifest themself physiologically, psychologically, and socially. As we age some things improve such as knowledge, wisdom and the ability to be self – sufficient and independent.
As we age, our bodies change in many ways that affect the function of both individual cells and organ systems. These changes occur little by little and progress inevitably over time. However, the rate of this progression can be very different from person to person.