How do the skin age? Intrinsic aging and extrinsic aging

Intrinsic aging and extrinsic aging
Aging can be divided into intrinsic aging and extrinsic aging. Many people will concern about their facial skin, especially woman and girls. Many people try to apply cosmetics and skin care products to make their skin younger, even plastic operation. How do the skin age? 
Intrinsic aging
It means the function of skin ages by their Genetic Inheritance.
The functions decay with lack of hormones. The cells and water decrease and also glands reduce to excrete lipids. The skins will be dry, not elastic, and well looking.

Fertilized egg already has cell divisions and has skin from the eighth month.
The skin of new born baby is very thin and transparent. The fibers in dermis will grow with better elasticity as they grow to teenager. After 30 years old, the excretion of hormones starts to reduce and cause less cell diversions. The skin is coarse, especially after the climacteric.      

Extrinsic aging
l   Stress at work,  irregular or insufficient rest or sleep, smoking,
l   Apply the improper cosmetics to increase the burden of skin. Incorrect washing face cause the dirt fill in the pores.
l   ultra-violet radiation will cause photoaging if overexposure under the sun. The radiation will damage the cells. The lipids will oxidate and produce more free radicals.

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