Final answer:
Senescence is the deterioration of physiological function that occurs with increasing age in animals, including humans. This natural aging process affects different aspects of the body and is characterized by changes in the skin, organs, tissues, and cognitive function.
Step-by-step explanation:
Virtually all animals, including humans, exhibit a deterioration of physiological function, or senescence, with increasing age. Senescence refers to the aging process, including biological, emotional, intellectual, social, and spiritual changes. It is a normal part of life, and it affects various aspects of the body, such as the skin, organs, and tissues. As we age, our bodies undergo various changes, such as reduced elasticity, thinning of tissues, loss of muscle tone, and decreased cognitive function.