Intrinsic and Extrinsic Ageing 101: Your complete guide

Picture this: Your skin is your lifelong canvas.

And the ageing process is like an ever-evolving masterpiece.

It’s like an art project where nature and nurture collide.

Skin ageing comes down to two things: intrinsic and extrinsic ageing.

So, whether you’re on a quest for the fountain of youth.

Or you are simply curious about the secrets of a youthful complexion.

Join us as we delve deep into skin science and the effects of ageing.

Skin Ageing is an Intricate Process

Skin ageing is complex, as this study (1) demonstrates; it is a multifaceted biological process influenced by various intrinsic and extrinsic factors.

These factors contribute to the loss of your skin’s structural integrity, leading to common signs of ageing, including lines, wrinkles, a sallow complexion, crow’s feet, sagging skin, and hyperpigmentation.

Whilst some aspects of skin ageing are beyond our control, others can be managed.

Intrinsic and Extrinsic Ageing

Age is Not the Sole Determinant

Understanding that your chronological age doesn’t solely determine skin ageing, as this research shows (2), the fact that several factors play a role in how your skin ages:

Intrinsic Ageing

So, let’s look at the impact of internal factors. Your natural genetic ageing process occurs over time and gradually slows down cellular and biological processes.

Intrinsic ageing is influenced by hormone shifts, free radicals, and the body’s diminishing ability to repair skin damage.

Fundamental changes include decreased fibroblasts, weakening of your skin’s elastic matrix, collagen depletion, reduced oil production, hormonal shifts, slower cellular turnover, and even diminished blood vessel supply.

Intrinsic ageing is often called “chronological ageing” or “genetic ageing in many esthetician circles.”

Still, either way, your natural ageing process occurs internally and is primarily influenced by genetic factors and the passage of time.

Let’s break down the critical aspects of intrinsic ageing for you to make it easy:

1. Cellular and Biological Changes: Intrinsic ageing involves a gradual slowing of your body’s cellular and biological processes. This includes reduced cell turnover, which leads to a build-up of dead skin cells on your skin’s surface. As a result, your skin may appear dull and less vibrant.
2. Hormone Shifts: Age-related hormonal changes can affect your skin. For instance, a decline in estrogen levels in women during menopause can contribute to skin dryness and reduced collagen production. Learn more about the effects of hormonal changes on Menopause Dry Skin and how to keep your skin healthy during menopause.
3. Fibroblast Activity: Fibroblasts produce collagen, elastin, and other structural proteins in your skin. With age, fibroblast activity decreases, leading to reduced collagen and elastin production. This can lead to a loss of skin elasticity and the formation of wrinkles.
4. Collagen Depletion: Collagen, a critical protein that provides structural support to your skin, diminishes as you age. This reduction in collagen can lead to your skin sagging and the development of fine lines and wrinkles.
5. Reduced Oil Production: As we age, the sebaceous glands, which produce natural oils that keep our skin soft and supple, become less active. This reduction in oil production can cause our skin to become dry.
6. Blood Vessel Supply: Ageing can reduce the number and functionality of blood vessels that supply your skin with nutrients and moisture. This may make your skin look paler and less vibrant.
7. Fat Shrinkage: The fat layer beneath your skin, the subcutaneous layer, changes with age. Fat shrinkage can lead to deep furrows and wrinkles, particularly in your cheeks and around your eyes.
8. Cellular Repair: Your body’s ability to repair your skin’s damage decreases with age, making it less effective at addressing issues like UV, healing wounds and other environmental damage.

As you can see, intrinsic ageing is a natural and inevitable part of the ageing process, and its effects vary depending on genetics and lifestyle.

Whilst intrinsic ageing can’t be stopped or reversed, you can manage and mitigate its impact through a healthy lifestyle, proper skin care, and sensible, protective measures to maintain overall skin health.

Extrinsic Ageing

These, then, are factors you can control. They encompass your lifestyle choices, such as smoking, alcohol consumption, exposure to environmental elements (UVA rays, pollutants, heat, and radiation), stress, poor nutrition, sleep deprivation, and more.

Extrinsic ageing is often called “photoaging” or “environmental ageing.

Unlike intrinsic ageing, which is largely genetically determined and progresses naturally over time, extrinsic ageing is influenced by choices and environmental exposures.

This research (3) points toward the following critical factors that contribute to extrinsic ageing:

1. Sun Exposure: Prolonged and unprotected exposure to ultraviolet (UV) radiation from the sun is a significant contributor to extrinsic ageing. UV rays generate free radicals, which can damage collagen and elastin fibres in your skin. This damage results in wrinkles, fine lines, age spots, and reduced skin elasticity.
2. Smoking: Smoking is a well-known accelerator of skin ageing. It reduces blood flow to your skin, depletes oxygen and nutrients, and releases harmful chemicals that break down collagen and elastin. Smokers often exhibit premature signs of ageing, including deep wrinkles, uneven skin tone, and reduced skin elasticity.
3. Alcohol Consumption: Excessive alcohol consumption can dehydrate your skin, leading to dryness and a dull complexion. It can also dilate your blood vessels, causing redness and broken capillaries. Over time, alcohol abuse can contribute to developing spider veins and other visible signs of ageing in your skin.
4. Environmental Pollutants: Environmental pollution, such as smog and particulate matter, can harm your skin. These pollutants can generate free radicals that damage skin cells and accelerate ageing. They may also contribute to conditions like acne and inflammation.
5. Sleep Deprivation: Insufficient sleep can disrupt your body’s natural repair and regeneration processes, including those involved in your skin. Chronic sleep deprivation can lead to dark circles under your eyes, a sallow complexion, and increased fine lines.
6. Poor Nutrition: A diet lacking essential nutrients, particularly antioxidants like vitamins A, C, and E, can contribute to premature ageing. These nutrients protect your skin from oxidative stress and support its overall health.
7. Central Heating and Air Conditioning: Prolonged exposure to indoor heating and air conditioning systems can lead to dry indoor air, which can dehydrate your skin. This dryness can exacerbate the appearance of fine lines and wrinkles.

Understanding the impact of these extrinsic factors on skin ageing underscores the importance of protective measures.

Implementing strategies such as daily sun protection, a balanced diet, adequate hydration, and a healthy lifestyle can help you mitigate the effects of extrinsic ageing and promote your skin’s health and longevity.

To conclude. The naked truth

Hopefully, understanding the intricate interplay between intrinsic and extrinsic ageing will empower you to make more informed choices in your pursuit of radiant, youthful skin.

But if you are still confused, here’s a little recap:

Genetics and time, an internal transformation governs intrinsic ageing. This process entails slowing cellular and biological activities, hormonal fluctuations, diminished fibroblast function, collagen loss, reduced oil production, blood vessel changes, fat shrinkage, and compromised cellular repair.

Intrinsic ageing, though inescapable, will differ among all of us, and it represents a core element of ageing.

External forces and lifestyle choices drive Extrinsic Aging. Factors such as sun exposure, smoking, alcohol consumption, environmental pollutants, sleep deprivation, suboptimal nutrition, and indoor climate conditions can also exacerbate the effects of intrinsic ageing on your skin.

The good news is that many extrinsic factors are preventable by adopting a healthy lifestyle and using topicals, such as antioxidants, to fight free radicals.

So, you could say that skin ageing is a multifaceted process influenced by both intrinsic and extrinsic factors. Collectively, these factors give rise to various visible signs of ageing, such as lines, wrinkles, sallow complexion, crow’s feet, sagging skin, dark spots, and uneven texture.

And as you navigate the complexities of skin ageing, it becomes evident that age is but one element in the broader equation.

A combination of factors shapes your skin’s journey through time.

By recognising and addressing these influences and embracing protective strategies like sun protection, a good skincare routine, a balanced diet, optimal hydration, and stress management, you can help manage some external factors contributing to ageing.

You can work to preserve and enhance your skin’s health and beauty now and for many years to come.

References

1. Intrinsic and extrinsic factors in skin ageing: a review.

2. Fighting against Skin Aging.

3. Defining skin ageing and its risk factors: a systematic review and meta-analysis.