A series of new studies is providing fresh insight into how and why skin ages, pointing to factors that influence visible appearance and long term skin health. Researchers are increasingly turning to the skin microbiome and molecular biology to explain why some people appear to age more slowly than others, even when they are the same chronological age.
One study led by scientists at Unilever examined the skin microbiome of people who showed either delayed or premature signs of ageing. Despite being of similar age, participants who looked older tended to have a less resilient microbiome, while those who appeared younger had a more stable bacterial community on their skin. The authors suggested that microbiome resilience could act as a marker of skin health and might influence how ageing is perceived.
Elena Reva, founder of Dermoi, reflected on this connection: “We are learning that the microbiome is not just a surface detail but a fundamental part of skin health. A stable and balanced microbial community appears to strengthen the skin barrier, making it more resilient to external stressors and slowing the visible signs of ageing.”
Further evidence comes from a large open access analysis published in Frontiers in Aging. Researchers found that the skin microbiome shifts significantly with age across different body sites. Diversity and metabolic potential were altered, with patterns varying depending on whether samples were taken from oily, dry, or moist skin regions. These findings underline that ageing is not uniform across the body, and that changes in skin microorganisms may be linked to differences in barrier function and appearance.
A separate investigation involving 479 volunteers in China explored the relationship between the facial microbiome, skin physiology, and ageing. The study, published in Microbiome, found that alterations in bacterial composition correlated with visible signs of ageing such as reduced elasticity, lower moisture levels, and decreased skin gloss. The authors concluded that microbiome composition could interact with physiological properties to influence how ageing manifests on the face.
Reva added: “When we talk about the microbiome, it is helpful to think of it as an ecosystem. Just as diversity in nature supports resilience, diversity in the skin microbiome supports healthier skin. Nutrients such as prebiotics and probiotics can help beneficial microbes thrive, while bacterial by-products known as postbiotics contribute to pH balance, hydration, and barrier repair.”
Beyond the microbiome, scientists are also exploring ageing at the genetic and epigenetic level. A recent review published in the International Journal of Dermatology examined epigenetic clocks in skin conditions such as psoriasis, atopic dermatitis, and hidradenitis suppurativa. Patients with these conditions showed accelerated biological ageing compared with healthy controls, suggesting that inflammation and chronic disease may speed up molecular ageing pathways in skin.
Together, these findings reinforce the idea that skin ageing is influenced by a mix of biology, environment, and microbial ecosystems. While lifestyle factors such as sun exposure, diet, and sleep remain important, new research is highlighting how invisible processes beneath the surface also shape visible outcomes.
As Reva explained: “The exciting part of this research is that it opens the door to practical strategies. If we can support the microbiome and reduce chronic inflammation, we may be able to complement traditional approaches to skin care with methods that target the underlying biology of ageing.”
Although much of this work is still at an early stage, the results mark an important shift. Instead of viewing beautiful skin as only a matter of surface treatments, researchers are uncovering deeper mechanisms that could transform how ageing is understood and managed in the years ahead.