Collagen formation reduces by 1% yearly from the age of 25 years old and ceases by the time we are in our 50s. If we factor the external causes that contribute to aging such as
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UV sun exposure
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Stress
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Poor diet
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Smoking
Our collagen loss is further accelerated. Therefore, as we age, our skin thins due to the progressive reduction in collage production and eventually increased collagen loss. Collagen arrangement in the skin also becomes less regular and compact, the skin progressively loses its elasticity and lengthens resulting in sagging of the facial structure.
Other common causes of skin laxity we frequently encounter include eg sudden weight loss due to diet or illness.