As we enter our middle 20’s, unfortunately, the amount of collagen begins to decline. Even more so in women due to menopause where a significant amount of collagen is lost in the first 5 years. Your body naturally produces the collagen it needs, but around the age of 25, production starts to decline by about 1-2% each year. By the time a woman reaches the age of 40, she will have lost between 10-20% of her collagen. Most of the changes in your skin caused by aging happen in the dermis layer, which loses about 20-80% of its thickness.