There are two types of skin aging that occur at the same time: intrinsic and extrinsic.
Intrinsic skin aging is caused primarily by internal factors within the body, such as genetics and the normal aging processes.
Extrinsic skin aging, or photo-aging, is caused by environmental factors such as sunlight and lifestyle habits such as smoking.
With each passing year, the average moisture content of the stratum corneum decreases gradually as a result of hormonal changes that, over time, cause a reduction in sebum production.
Cigarette smoking profoundly affects skin aging, as nicotine intake expedites the breakdown of skin cells.
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