The 12 Mechanisms Of Aging

The reality is, we are all aging. But what is the exact biological impact of this process on the skin? Modern longevity science has moved beyond surface-level aesthetics, mapping out precisely what happens at a cellular level as humans age [1].

For brands, formulators, and professionals in the dermatology and cosmetics space, understanding these biological root causes is essential for developing the next generation of scientifically-backed products [2].

The Biological Criteria for Aging

Before exploring specific mechanisms, it is important to understand how scientists classify these biological processes. To be officially recognised as a "hallmark" of aging, a physiological process must meet three strict criteria [3]:

1. Age-associated manifestation: The biological issue must clearly appear and progressively worsen as organisms get older.

2. Acceleration by experimental accentuation: If intentionally triggered or worsened in a laboratory setting, it must cause rapid, accelerated physical aging.

3. Opportunity for intervention: If a therapeutic or cosmetic treatment targets this specific problem, it must result in a measurable slowing or reversal of aging markers.

The 12 Hallmarks of Aging: An Overview

In 2013, the foundational "Hallmarks of Aging" were defined by researchers. Over the past decade, extensive scientific validation expanded this list, bringing the total to twelve fundamental processes in 2023 [3]: 

Fig 1. The Hallmarks Of Aging

Deep Dive: 5 Crucial Mechanisms Driving Skin Aging

For personal care and cosmetics formulation, certain biological hallmarks have a substantial

impact on the skin's visible aging timeline. Here is a closer look at the five mechanisms that

represent the frontier of longevity skincare.

1. Chronic Inflammation ("Inflammaging")

What it is: "Inflammaging" is the result of long-lasting, low-level inflammation throughout the body. Over time, this constant state of stress makes it much harder for the skin to heal and renew itself [3,4].

Why it matters for skin: This causes the skin to break down its collagen and elastin, weaken its protective barrier, and heal much slower, directly leading to wrinkles, sagging, dryness, and an uneven tone.

Fig 2. Inflamm-aging in the Skin

2. Dysbiosis

What it is: Dysbiosis is a structural imbalance within the skin’s microbiome. In a healthy state, diverse populations of beneficial microorganisms coexist to protect the skin [5].

Why it matters for skin: As we age, our skin's physical composition undergoes significant changes that alter the "microenvironment" where these microbes live. This factor causes:

• Decreased Lipid Production: A reduction in natural oils (sebum) removes a primary nutrient source for beneficial bacteria.

• Diminished Hydration: Lower moisture levels create a drier, more difficult environment for microbes to survive.

• Barrier Fragility: A weakened physical defense layer makes the skin more susceptible to external stressors (like UV damage) and instability [6]. (fig. 3)

Fig 3. Impact of the Skin Microbiome on Wrinkle Formation and Potential Modulation During Aging

3. Altered Intercellular Communication

What it is: To stay healthy, the body's cells constantly send messages to each other. As you age, this communication breaks down, weakening the immune system and making it harder for the body to heal and protect itself [3].

Why it matters for skin: Healthy skin relies on different layers of cells talking to each other to produce collagen and keep the skin strong. When this communication breaks down, the skin struggles to heal or protect itself from sun damage, which leads to a weaker barrier and easier bruising [7].

4. Loss of Proteostasis

What it is: Proteostasis is the cells' recycling center, responsible for building and breaking down proteins (collagen, elastin and keratin). When it stops working properly, damaged proteins pile up and create a mass amount of toxic cellular waste [3].

Why it matters for skin: The buildup of this cellular waste creates an unhealthy environment that weakens the cells. As a result, the skin loses its natural radiance and its ability to remain firm and elastic [8].

5. Epigenetic Alterations

What it is: Picture DNA as the permanent blueprint of the body; the epigenome acts as the switches that turn specific genes on or off based on our environment and lifestyle. As we age, the mechanisms controlling these switches begin to fail, preventing genes from operating as efficiently as they did in youth [3].

Why it matters for skin: Rather than just being a symptom of getting older, shifts in the epigenome actively drive the skin's aging process. Fortunately, scientists can map these genetic switches to evaluate exactly how well certain topical treatments work, allowing us to see if a product can genuinely decelerate aging within the cells [9].

Where does Sequential fit in?

Today, consumers demand "healthspan" and "skin longevity" products that target root

biological causes rather than acting as temporary cosmetic fixes [12].

Targeting complex issues like chronic inflammation and microbiome imbalance requires highly advanced, active formulations. 

More importantly, regulatory bodies and modern consumers require strict, physiological proof of efficacy.

Testing these advanced claims in standard petri dishes or skin models fails to capture the full interconnected picture of how we age on a biological level. This is where Sequential Bio steps in.

Sequential's multi-omic platform integrates multiple layers of biological data to provide a holistic view of a formula’s performance:

SNP Detection:  Maps a consumer's unique DNA to reveal their natural baseline for skin aging, such as their likelihood to develop wrinkles. It helps predict how a consumer will respond to specific ingredients. This takes the guesswork out of formulation, empowering you to create highly personalized, science-backed product lines that you know will work.

Microbial Gene Expression: Uncover how genes are activated in response to treatments. This gives in depth- insight into how the skin's surface reacts to your formulation. 

Proteomics: Measures the complete protein profile (elastin, keratin and collagen)  of the skin to track how product impacts the cellular function and structural integrity. This gives you definitive proof that your product rebuilds and maintains the skin’s structure.

By shifting away from simple observational studies and toward deep-level multi-omic biological validation, Sequential's multi-omic platform validates what's happening at the molecular level, giving personal care and dermocosmetic brands proof of biological mechanism; not just efficacy, but clear, and actionable data. 

The future of longevity skincare isn't about concealing age; it’s about biological validation. The focus has shifted to the mechanism of action. Consumers want to know what is happening at a molecular level:  what is your product actually doing beyond the surface?

References 

1. Haykal, D. et al. (2025) 'Advances in longevity: The intersection of regenerative medicine and cosmetic dermatology', Journal of Cosmetic Dermatology. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC12268380/ (Accessed: 28 April 2026).

2. Klinngam, W. et al. (2025) 'Longevity cosmeceuticals as the next frontier in cosmetic innovation: A scientific framework for substantiating product claims', Frontiers in Aging, 6. Available at: https://doi.org/10.3389/fragi.2025.1586999 (Accessed: 29 April 2026).

3. López-Otín, C. et al. (2023) 'Hallmarks of aging: An expanding universe', Cell, 186(2), pp. 243-278. Available at: https://doi.org/10.1016/j.cell.2022.11.001 (Accessed: 29 April 2026).

4. Gabriel, N. (2025) 'Inflammaging: How chronic inflammation accelerates visible aging', Ultimate Cosmetics. Available at: https://www.ultimatecosmetics.com.au/blog/inflammaging (Accessed: 28 April 2026).

5. Borrego-Ruiz, A. and Borrego, J.J. (2024) 'Microbial dysbiosis in the skin microbiome and its psychological consequences', Microorganisms. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC11433878/ (Accessed: 28 April 2026).

6. Challa, V. et al. (2025) 'Microbiome–aging–wrinkles axis of skin: Molecular insights and microbial interventions', International Journal of Molecular Sciences, 26(20), p. 10022. Available at: https://www.mdpi.com/1422-0067/26/20/10022 (Accessed: 28 April 2026).

7. Lifespan.io (no date) Altered Intercellular Communication. Available at: https://lifespan.io/topic/altered-intercellular-communication/ (Accessed: 29 April 2026).

8. Skin Organoids in Proteostasis Research: Early Insights into Aging (2025). Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC12961993/ (Accessed: 29 April 2026).

9. Booth, L.N. and Brunet, A. (2016) 'The aging epigenome', Molecular Cell, 62(5), pp. 728-744. Available at: https://pubmed.ncbi.nlm.nih.gov/27259204/ (Accessed: 29 April 2026).

10. Agrawal, R., Hu, A. and Bollag, W.B. (2023) 'The skin and inflamm-aging', Biology, 12(11), p. 1396. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC10669244/ (Accessed: 29 April 2026).

11. Lancôme (2026) Lancôme Booklet. Available at: https://www.science.org/cms/asset/522c73c5-09e4-4279-96eb-8f764c08dc9c/_20260316_cpub_lancome_booklet.pdf (Accessed: 29 April 2026).

12. Vogue (2026) 2026's biggest skincare trends to try now. Available at: https://www.vogue.com/article/2026s-biggest-skincare-trends-to-try-now (Accessed: 29 April 2026).