Why skin ages: collagen, elastin & the extracellular matrix

Fibroblasts continually make and remodel collagen, elastin and other matrix components. With age, fibroblast activity changes, collagen becomes more fragmented, and the communication between cells and the matrix surrounding them becomes less efficient.

Fragmented collagen matters more than it sounds. Fibroblasts attach to intact collagen fibres and are mechanically stretched by them; when the scaffold fragments, they lose that tension, become less active, and produce less new collagen while producing more of the enzymes that degrade it. The process reinforces itself.

Genetics, hormonal change and time gradually alter skin thickness, hydration, repair capacity and elasticity. Collagen content and organisation decline, while elastin becomes less functionally efficient. Cell turnover slows and the barrier repairs more slowly after disruption.

The rate is not identical for everyone, so a claim such as “you lose exactly one per cent of collagen every year” is a rough population-level simplification, not an individual forecast. It is repeated in marketing far more often than it is qualified.

Skin protected from sun for a lifetime still ages — it simply does so differently. Compare the inner upper arm with the back of the same person’s hand: both are the same age, and only one has been in the sun.

Ultraviolet radiation increases oxidative stress and matrix-degrading enzymes, contributing to collagen breakdown, mottled pigmentation, coarse texture and abnormal elastin accumulation. In Singapore, year-round equatorial UV makes daily photoprotection the highest-value anti-ageing intervention available — and the cheapest.

Two practical points follow. Cloud cover reduces UV far less than people assume, so an overcast Singapore afternoon is not a day off. And sunscreen applied once at 8am has largely stopped working by mid-afternoon — reapplication is the part most people skip, and it is the part that determines whether the product does anything.

This is the piece most often missing from skincare-focused explanations, and it is why some concerns never respond to treatments aimed at the skin surface.

A cream cannot restore bone, and a filler does not repair sun-damaged epidermis. Almost every disappointing treatment outcome traces back to a mismatch between the layer that changed and the layer that was treated.

• Loss of dermal support makes pore openings appear more obvious, even though pore number does not change.
• Reduced barrier efficiency and altered lipids increase dryness and roughness.
• Repeated facial movement creates dynamic lines that may later persist at rest.
• Volume and bone changes alter folds and overall contour.
• Sun damage adds uneven pigment and visible vessels on top of intrinsic ageing.

Worth knowing: pore size is largely determined by genetics, sebum production and dermal support. Treatments can make pores less conspicuous. Nothing closes them, and any product claiming to is describing a temporary appearance change.

• Smoking — among the strongest modifiable accelerators of skin ageing, affecting both matrix and microcirculation.
• Air pollution — particulate exposure is associated with pigmentation and ageing changes.
• Glycation — sugars cross-linking with collagen make fibres stiffer and less functional over time.
• Sleep and stress — affect barrier recovery and repair.
• Rapid or repeated weight fluctuation — alters facial fat compartments and can leave laxity behind.
• Over-treatment — excessive exfoliation or aggressive procedures can impair the barrier and provoke pigmentation, particularly in deeper skin tones.

• Daily broad-spectrum sunscreen, applied properly and reapplied, plus sensible sun avoidance.
• Topical retinoids where appropriate and tolerated — the best-evidenced topical for photoageing.
• Not smoking.
• Adequate nutrition and protein.
• Sleep, and management of chronic medical conditions.
• A consistent moisturising routine that supports rather than strips the barrier.

Vitamin C and other antioxidants are useful adjuncts but do not replace sunscreen or a retinoid. If a budget only stretches to two things, those two are sunscreen and a retinoid — and consistency matters more than product cost in both cases.

The honest version of that last row matters. Where the change is structural and advanced, a non-surgical device produces a modest result at repeated cost. Saying so is more useful than selling a course that was never going to meet the expectation.

Treatments that work by stimulating new collagen do not show their result immediately. Remodelling continues over weeks to months, which has two consequences worth planning around.

First, judging a collagen-stimulating treatment at two weeks is judging inflammation, not outcome. Second, stacking a second treatment because the first “did not work” often means treating before the first has finished. Standardised photographs at consistent lighting and angle are far more reliable than memory for tracking gradual change.

Maintenance is also part of the arithmetic. Ageing continues after treatment, so results are held rather than banked, and the honest cost of any plan is the ongoing one rather than the first course.