As your body ages, the appearance and characteristics of your skin change. Visible aging of your skin starts around age 25 as your natural regenerative processes begin to slow.
Your skin replaces old cells more slowly and there is a slower turnover of the surface skin as well as slower wound healing.
Around age 45, the skin begins to thin, due in part, to hormonal changes. This thinning makes your skin more fragile and vulnerable to damage by abrasion and more sensitive to irritating environmental factors and allergens.
The coils of collagen and elastin in your skin suffer cuts and cross linking damage and as a result, the skin loses much of it's strength and elasticity. The moisture holding proteoglycans and glycosaminoglycans decrease in abundance, making the skin become dryer and looser.
Your skin loses fat, so it looks less plump and smooth. The number of blood vessels in your skin decreases, and the skin loses its youthful color and glow.

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