Why and how do lips become thinner with age?
Facial ageing is complex, with every anatomical structure – skin, muscles, fat and bone – gradually changing. Among these changes, lip evolution is often underestimated, although it plays a major role in expression, facial balance and perceived youthfulness. Researchers recently shed precise light on this process. A study lasting over seven years by plastic surgeons led by Dr Patrick L. Tonnard analysed lip changes with age. Published in Plastic and Reconstructive Surgery, this research highlights objective anatomical changes between younger and older subjects, providing valuable data for doctors.
Lips, an essential element of a youthful face
Lips are central to facial harmony. Their volume, shape and position directly influence expression, the smile and sensuality. In a young face, the upper lip is short, full and well defined. It slightly reveals the teeth when smiling, contributing to vitality. With age, this architecture changes: the lip lengthens, loses projection, thins and the smile becomes subtler. These often subtle changes contribute to a tired or severe appearance.
Dr Tonnard's study scientifically confirms what doctors have long observed: lips age through precise, measurable and predictable mechanisms. Understanding these changes better guides rejuvenation strategies while respecting natural facial proportions.
The scientific study: seven years of observation and analysis
Between 2010 and 2017, researchers conducted a rigorous study involving two volunteer groups: one hundred women and one hundred men divided into two age ranges, 20 to 30 and 65 to 80. The aim was to observe lip morphology differences decades apart through precise measurements and magnetic resonance imaging (MRI).
Results showed significant age-related upper lip lengthening: 19% in women and 18% in men. Meanwhile, thickness decreased, with estimated volume loss of 41% in women and 33% in men. These figures confirm that upper lip ageing involves both lengthening and thinning, closely linked to supporting tissue changes and facial volume distribution.
Researchers also noted marked thinning in the nasolabial region, between the nose base and lip edges. This tissue loss contributes to lines above the mouth, often called barcode lines.
Anatomical causes of lip ageing
Lip ageing results from progressive interaction between several biological and mechanical mechanisms rather than one factor.
With age, skin tissues lose elasticity as collagen and elastin, essential firmness fibres, decrease. Perioral muscles, particularly orbicularis oris, relax and lose tone. Meanwhile, fat compartments around the mouth diminish, reducing structural support.
The facial skeleton also changes: upper jaw bone resorption reduces lip support, making it appear longer and flatter. This changes proportions between philtrum height (the area between nose and upper lip) and visible red lip height. The lip appears farther from the nose and covers more teeth, altering the smile.
Finally, repeated movements from speech, eating and daily expressions cause long-term microtrauma, weakening delicate lip skin and accelerating thinning.
Lip ageing: differences between men and women
The study also revealed ageing differences between sexes. Women experience greater volume loss, particularly in the upper lip, explained by naturally thinner skin, lower collagen density and substantial hormonal changes after menopause. In men, the process is slower, but proportional lip lengthening is comparable.
These distinctions emphasise personalised lip rejuvenation. Proportions, muscle structure and aesthetic expectations differ by sex and must be respected to preserve facial harmony and naturalness.
Aesthetic consequences of lip ageing
Upper lip lengthening and volume loss accompany several noticeable changes: the philtrum lengthens, reducing the visible distance between the nose and red lip; the red lip thins and loses its natural border and characteristic curve; corners droop, giving a sad or tired expression; the smile changes and upper teeth become less visible.
These changes alter lower facial dynamics. They affect aesthetics and emotional perception, making the face seem less lively and more severe.
Aesthetic medical procedures for ageing lips
Aesthetic medicine in Geneva places restoration of natural facial balance at its centre. Treating ageing lips means precisely and subtly restoring lost proportions rather than artificially "inflating" them.
Morphological analysis comes first: understanding individual anatomy, philtrum length, visible red lip height, symmetry and smile dynamics.
Treatment then uses complementary approaches. Hyaluronic acid injections redefine contours, restore lost volume and rehydrate lip mucosa. Product choice, concentration and injection technique determine a natural result without excessive projection.
Dr Romano often combines injections with collagen synthesis stimulation techniques (medium peels, fractional lasers or laser photorejuvenation) to improve skin quality and density around the lips.
Finally, cosmetic surgery may be considered for more pronounced sagging. When indicated, it restores a younger, more dynamic smile.
Preventing lip ageing: appropriate habits and care
Although ageing is inevitable, preventative measures can reduce its effects. Daily sun protection is essential because lip skin is particularly sensitive to UV radiation, which degrades collagen.
Regular hydration, stopping smoking and limiting repetitive expressions help preserve tissue tone and suppleness. Topical retinoids, amino acids and peptides can stimulate cell regeneration and strengthen dermal structure.
Towards a scientific, natural approach to lip rejuvenation
Dr Tonnard's study provides a solid scientific basis for understanding lip ageing. Objectively documenting anatomical changes through precise measurements allows doctors to adapt protocols rigorously and judiciously.
Lip rejuvenation should be perceived as restoring physiological volume and proportions rather than artificial transformation. Every procedure, whether hyaluronic acid or regenerative techniques, aims to restore lower facial balance while respecting individual natural characteristics.
This precise, science-based approach fully reflects Geneva's aesthetic medicine philosophy: personalised, safe and measured care for elegant, harmonious results.
Conclusion: why do our lips become thinner with age?
Scientific research sheds decisive light on this often-neglected aspect of facial ageing. By demonstrating upper lip lengthening and thinning over time and precisely quantifying these changes, Dr Patrick L. Tonnard and his team help doctors better target procedures.
In aesthetic medical care, detailed lip physiology knowledge is a major asset. It enables precise treatments adapted to every morphology while preserving authentic expression.
In Geneva, aesthetic medicine uses these scientific data for a considered approach to facial rejuvenation. Refreshing a smile, restoring lower facial balance and recovering natural lip dynamics are now achievable through detailed understanding of ageing mechanisms and increasingly refined medical techniques.
