Usually, the visible sign of aging is the condition of our skin. As you grow older, your skin tends to change in texture.

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The scientific term used to refer to aging is senescence. It means a stage where the cells of the body stop dividing and no new ones are formed or they are formed slowly. 

When old age knocks, visible signs usually include wrinkles, sagging skin and spots in people with lighter skins. 

Apart from the wrinkles and the sagging, the skin becomes thinner and the blood vessels; the veins becomes visible and appear larger. Additionally, the pores that open up on the skin also grow bigger. 

Hyaluronic acid which is a chemical produced by the body to nourish the skin reduces over time leaving our skin dryer and rougher. As this acid depreciates, the skin becomes looser. 

The sebaceous glands of the skin begin to produce less oil to keep the skin moist hence the dryness. This also exposes the skin to injury even with slight bruises and reduces the body's ability to maintain body temperature.

Despite the enlarging of the sweat pores above the skin, the sweat glands produce less sweat. This makes it even harder for the body to cool and this could expose one to heat stroke, a condition where the body temperature rises to very high level and could damage yo organs. 

Generally, aging can have tremendous effects on the skin as one might be at high risks of skin injury. The skin also looses its sensitivity with time hence one might become unable to sense touch, heat and cold.