How the environment affects the skin’s ageing process

Skin ageing was long considered to be an exclusively genetic process. However, modern dermatology has shown that chronological age plays only a partial role, and that the condition of the skin is largely determined by the external environment and lifestyle.

Most visible changes are linked to exogenous ageing. This process is triggered by ultraviolet radiation, air pollution, smoking and stress – factors which, in medicine, are collectively referred to as the ‘exposome’. The influence of the exposome is confirmed by clinical observations of monozygotic twins: under different living conditions, by the age of 45, the visual difference in the condition of their skin amounts to 10–15 years. The skin bears the brunt of the external environment, acting as a biological shield.

Ultraviolet radiation: the main factor in premature ageing

Solar radiation remains the most extensively studied external factor. It is photoageing that is considered the primary cause of early wrinkles, pigmentation disorders and loss of skin elasticity. The spectrum of sunlight contains two types of rays that are harmful to tissue: UVB and UVA.

Type B (UVB) rays have a short wavelength, penetrate only the epidermis and cause sunburn. Type A (UVA) rays act imperceptibly and deeply. They have a longer wavelength, pass freely through clouds, smog and window glass, penetrating deep into the dermis.

Exposure to ultraviolet radiation triggers pathological processes in the skin:

oxidative stress (excessive formation of free radicals that damage cell membranes);
damage to cellular DNA (disruption of the structure of nucleic acids, reducing the tissues’ ability to regenerate);
collagen breakdown (the radiation activates metalloproteinase enzymes, which break down collagen and elastin whilst simultaneously blocking the synthesis of new structural fibres);
chronic micro-inflammation (a process known internationally as ‘inflammaging’).

What is particularly dangerous is that the damage accumulates gradually. The skin has a high capacity for compensation, which is why the consequences of excessive sun exposure often only become apparent years later. In dermatology, there is a term known as ‘skin memory’. It refers to the ability of tissues to retain traces of long-term UV exposure. By the age of 35–40, the skin’s internal reserves are depleted, and the effects of this loss of protection manifest as deep wrinkles and hyperpigmentation.

Why photoageing differs from natural ageing

A practising dermatologist is able to visually distinguish natural chronological ageing from changes caused by solar radiation. These are two distinct clinical presentations requiring fundamentally different therapeutic approaches.

With natural ageing, changes occur relatively evenly. The skin gradually becomes thinner, and the production of collagen and hyaluronic acid decreases. The tissues retain a relative smoothness and a pale but even tone.

Photoageing presents differently:

deep wrinkles (the skin loses elasticity, becomes dense and takes on a parchment-like texture);
pigment spots (solar lentigines due to the irregular activity of damaged melanocytes);
vascular changes (telangiectasia or persistently dilated capillaries on the cheeks and nose);
coarse skin texture (activation of hyperkeratosis as a protective response to ultraviolet radiation);
loss of colour uniformity (the skin takes on a dull, grey or yellowish hue).

These changes are particularly pronounced on exposed areas of the body: the face, neck and hands. This is precisely why modern recommendations for the prevention of skin ageing almost always include sun protection as a fundamental medical tool, rather than merely a cosmetic measure.

Air pollution and chronic skin inflammation

In recent years, an increasing number of studies have focused on the impact of environmental pollution on the skin. Fine particulate matter, fuel combustion by-products and industrial pollutants are capable of penetrating the skin barrier and triggering oxidative stress.

In practice, residents of large cities are more likely to experience the following clinical signs:

a dull, sallow complexion due to hypoxia and impaired microcirculation;
impaired skin barrier function (severe dryness, flaking and itching);
inflammatory reactions (exacerbation of acne, rosacea and atopic dermatitis);
hyperpigmentation in the cheekbone area;
accelerated ageing.

The impact of PM2.5 particles is currently the subject of particularly active research. These microparticles are associated not only with respiratory diseases but also with the acceleration of age-related changes in the skin. By penetrating the lipid barrier, they trigger a cascade of inflammatory reactions. When smog particles settle on the skin, they interact synergistically with ultraviolet radiation, which dramatically increases the number of free radicals.

Modern dermatology increasingly views the skin as part of the body’s overall system of interaction with the external environment. In effect, the skin becomes a kind of biological shield that bears the brunt of the consequences of urbanisation.

Chronic stress and skin ageing

The link between one’s psychological and emotional state and the condition of the skin is no longer regarded as abstract. Anatomically, the skin and the nervous system develop from the same embryonic layer (the ectoderm), which explains their close interconnection via a branched network of neuroreceptors.

Chronic stress affects the body systemically, which has a direct impact on the skin:

microcirculation deteriorates and the supply of oxygen to the tissues decreases;
immune regulation is disrupted (local immune defence of the skin is reduced);
cortisol production increases (this hormone slows down cell renewal, stimulates the breakdown of collagen fibres and disrupts lipid synthesis);
tissue repair is slowed down;
sleep quality deteriorates.

It is well known in dermatological practice that prolonged emotional stress can exacerbate inflammatory skin conditions and accelerate the ageing process.

Sleep is particularly important. During the deep phases of sleep, melatonin – a powerful natural antioxidant – is produced. It neutralises the effects of daytime oxidative stress and activates the repair of cellular DNA. Chronic sleep deprivation deprives the skin of this natural regenerative phase, which is associated with a deterioration in the skin’s barrier function and a reduction in its ability to repair itself.

Why anti-ageing skincare cannot compensate for lifestyle factors

One of the main misconceptions in the modern beauty industry is the belief that cosmetics can completely neutralise the effects of the environment. Topical products work primarily within the epidermis and cannot address systemic internal imbalances.

Even effective topical products have limited effectiveness if the following factors persist:

smoking;
chronic sleep deprivation;
excessive UV exposure;
severe stress;
an unbalanced diet.

Smoking is particularly damaging to the skin. Nicotine causes spasms in small blood vessels that last up to 90 minutes after a single cigarette, leading to ischaemia and tissue hypoxia. The toxic components of smoke deplete vitamin C reserves, which are essential for collagen synthesis. In dermatology, there is even a term, ‘smoker’s face’, used to describe the characteristic changes in the skin.

To make the most of your skincare budget, it is advisable to distinguish between marketing claims and the skin’s actual physiological needs.

Where savings are justified:

Skin cleansers (foams, gels). They are in contact with the skin for less than a minute, so any expensive anti-ageing ingredients they contain are simply washed away with water. The main requirement is for mild surfactants that do not damage the skin barrier.
Basic moisturising creams. Their purpose is to restore the lipid barrier. Affordable pharmacy products containing ceramides and fatty acids do the job.
Instant-effect products (patches, sheet masks). These create a temporary effect through occlusion, but do not affect the underlying ageing processes.

What you shouldn’t skimp on:

Sunscreen (SPF). This is a key element in preventing ageing. The product must contain stable, broad-spectrum filters (protection against UVA and UVB).
Serums with active ingredients (retinol, vitamin C, niacinamide). These require stable chemical forms and proper, airtight packaging to preserve the activity of the ingredients.
Laboratory diagnostics. The condition of the skin often reflects the body’s internal state. Hidden deficiencies (such as iron-deficiency anaemia) reduce the effectiveness of any topical skincare.

The modern approach to anti-ageing is gradually shifting away from aggressive cosmetic correction towards the concept of maintaining the health of the skin as an organ.

A new trend: skin longevity

One emerging trend is the concept of ‘skin longevity’ – maintaining the skin’s long-term functionality. This is not simply about masking the signs of ageing, but about preserving:

the skin’s barrier function;
its ability to regenerate;
its immune defences;
and its vascular stability.

This approach shifts the focus from aggressive methods to supporting the skin’s own resources: protecting the microbiome, improving microcirculation and supporting natural cellular cleansing processes (autophagy). This field successfully combines dermatology, gerontology, endocrinology and lifestyle medicine.

FAQ: Answers to frequently asked questions

Is it true that the sun is the main cause of skin ageing?

Yes. According to research, up to 80% of visible changes in facial skin are caused by regular exposure to ultraviolet radiation, rather than biological age.

Can air pollution affect the skin?

Yes. Air pollution from fine PM2.5 particles triggers oxidative stress and chronic inflammation, which accelerates the breakdown of the collagen matrix.

Does stress contribute to the appearance of wrinkles?

Yes. Chronic stress is accompanied by consistently high levels of cortisol, which slows down cell regeneration and impairs the skin’s ability to retain moisture.

Is it possible to completely stop skin ageing?

No. Ageing is a natural biological process. However, minimising external damaging factors can significantly slow down this process.

What really helps to slow down photoageing?

The most proven measures include regular sun protection, gentle cleansing of the skin to remove impurities, the use of antioxidants (such as vitamin C), a good night’s sleep and not smoking.

Do you need to apply sun cream when working in an office by a window?

Yes. Window glass blocks UVB rays but allows up to 80 per cent of long-wave UVA rays to pass through. These rays penetrate the dermis and stimulate collagen breakdown all year round.