For example, with age there is more fat in the central area of the torso and less muscle in the legs. The organs all slowly lose cells and some of their function. Aging is a process that affects each cell in the body. As the body ages, cells in all the tissues and organs of the body change. These cell changes affect the tissues and organs over time.
Cells slowly lose the ability to divide and reproduce as easily.
Fat gets deposited into cells, tissues, and organs. This contributes to a loss of function over time. Tissues such as bone, muscle and skin become much less elastic and stiffer. The body has many extra cells. The kidneys, liver, heart, and brain do not need all of their cells to function well.