More than 90% of skin's dermis is made up of collagen.
Fibroblast cells in our body produce collagen, which is the base molecule that holds our skin together. With aging, the decrease in collagen production generates a loss of hydration and a thinning of the skin, which lead to the appearance of wrinkles.
Gradually, the capillary tissues in the skin become thicker and less efficient, reducing the skin's ability to retain nutrients and water. Since skin is less healthy, there is a greater risk for it to develop stretch marks, brown spots and infections, as its ability to work as a barrier against bacteria and viruses is weakened.
The body's production of skin collagen begins to decrease around the age of thirty. This process starts speeding up in our fifties. Many studies have shown that our natural production of collagen could decrease at a rate of 1% per year after the age of thirty. So, by the time a person reaches 55, they could lose 25% of their collagen production capacity. By the age of 70, the loss could reach 40% and more.