Skin Aging: Internal and External Causes You Should Know

Skin aging is a complex and multifactorial process, influenced by both internal (intrinsic) and external (extrinsic) factors. Over the decades, we have learned that this process is not only the result of accumulated years, but also of the ongoing interaction between the environment, lifestyle, and each person's individual biology. Today, advances in dermatology and biotechnology have expanded our understanding of how skin ages and, more importantly, how we can intervene to slow down or even prevent some of these signs.

Intrinsic Aging: What Happens Inside Our Skin

Intrinsic aging, also known as chronological aging, is a natural process that occurs in all organs of our body, including the skin. As we age, our skin undergoes several structural and functional changes in its deeper layers, including:

1. Decreased collagen and elastin production : Collagen and elastin are key proteins that give skin its firmness and elasticity. However, as we age, the production of these proteins begins to decline around age 25-30. The drop in collagen levels leads to a loss of firmness, while elastin becomes less flexible, resulting in less resilient skin that is prone to sagging.

2. Reduced cellular activity : Over time, skin cells, such as fibroblasts and keratinocytes, become less active. This means the skin loses its ability to regenerate and repair itself as efficiently as before. In addition, skin stem cells, which produce new skin cells, also begin to lose their effectiveness, resulting in less cell renewal and a duller appearance.

3. Decreased lipids and natural moisturizing factors : Over time, skin also loses essential lipids and natural moisturizing factors, such as hyaluronic acid, which help maintain the skin's protective barrier and retain moisture. This loss results in drier skin that is more prone to fine lines and wrinkles. Read more about fine lines and wrinkles here.

4. Accumulation of "zombie cells" or senescent cells : Recent studies have identified the presence of senescent cells, or "zombie cells," which no longer function properly but remain in the skin. These cells release inflammatory factors that can damage nearby healthy cells, accelerating aging in the areas where they accumulate.

Extrinsic Aging: The Impact of External Factors on the Skin

Extrinsic aging results from the skin's exposure to external factors that accelerate and worsen the effects of intrinsic aging. These factors include sun exposure, pollution, smoking, poor diet, lack of sleep, and stress. We now know that these factors not only affect the skin superficially but can also reach its deeper layers.

1. Sun damage (photoaging) : Prolonged exposure to ultraviolet (UV) rays is a major cause of premature skin aging. UV rays penetrate deep into the dermis and damage cellular DNA, triggering the production of free radicals. These highly unstable molecules damage the skin's proteins and lipids, promoting the breakdown of collagen and elastin. The result is the appearance of deep wrinkles, sunspots, and loss of skin firmness.

2. Pollution and fine particles : Pollutant particles in the urban environment, especially PM 2.5, can penetrate the skin barrier and generate oxidative stress. This process increases skin inflammation and promotes the appearance of dark spots, sensitivity, and can even disrupt the skin's barrier function, making it more susceptible to further damage.

3. Stress and lack of sleep : Lack of sleep and chronic stress lead to an increase in the production of cortisol, the stress hormone. Elevated cortisol levels can impair collagen production and cause dehydration. Furthermore, lack of sleep interferes with the skin's natural repair cycle, reducing its ability to recover and protect itself from external aggressors.

4. Poor diet and smoking : A diet low in antioxidants and essential vitamins can accelerate skin aging by reducing its ability to defend itself against free radicals. Similarly, smoking decreases blood flow to the skin, limiting oxygenation and nutrient transport, resulting in a dull and dry appearance.

Scientific Advances in the Fight Against Skin Aging

Today, thanks to biotechnology and advanced research in dermatology, there are innovations that allow us to effectively combat and prevent these signs of skin aging through:

1. Pre-aging and preventative care : This innovative approach, called pre-aging , focuses on caring for the skin before the signs of aging appear, protecting it from external factors and helping it maintain its natural functions. The use of antioxidants, such as vitamin C and resveratrol, and broad-spectrum sunscreens are key tools for delaying the effects of aging.

2. Cell renewal therapy : Serums and treatments with ingredients such as hyaluronic acid, peptides, and growth factors help stimulate cell regeneration and collagen production, promoting firmer, more youthful-looking skin.

3. Protective barrier technology : There are products, such as anti-pollution shields , that protect the skin from pollution and free radicals, reducing environmental damage and preserving the skin's structure.

4. Elimination of senescent cells : Advances in biotechnology have enabled the development of ingredients that help eliminate senescent skin cells, promoting a healthier cellular environment and reducing chronic inflammation.

Conclusion

Skin aging is inevitable, but thanks to advances in dermatology and a growing understanding of biological processes, we can now intervene to protect and nourish our skin throughout the years. From preventing damage to repairing and renewing, skincare should be comprehensive and consistent. Adopting a pre-aging routine and using products specifically designed for cell regeneration and protection can make a significant difference, keeping skin healthy, firm, and radiant for longer.