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The Hallmarks of Ageing: What Is Actually Happening Inside You

The Hallmarks of Ageing: What Is Actually Happening Inside You

by Dr. Rhea Kotecha, MD, MSc (Nutrition) in Articles

Ageing is not a single event. It is not simply the passing of time. It is the gradual destabilisation of biological systems.

In 2013, researchers proposed a framework known as the Hallmarks of Ageing¹. In 2023, this framework expanded to 14 interconnected processes².

You do not need to memorise them. But understanding what they mean changes how you think about health. Because ageing follows patterns. And many of those patterns are influenced by how you live.


1. Genomic Instability

DNA Damage: Wear and Tear on Your Blueprint

Every cell contains DNA — your biological instruction manual. Over time, DNA accumulates small errors from:

• environmental toxins
• ultraviolet exposure
• inflammation
• normal cellular metabolism Your body repairs damage constantly. But repair efficiency declines with age¹. When damage accumulates faster than repair, cellular function weakens. Ageing begins quietly, at this level.

 

2. Telomere Attrition

The Protective Caps on Your Chromosomes Shorten

Telomeres sit at the ends of chromosomes. Each time a cell divides, they shorten slightly. When they become too short, cells stop dividing. This is part of natural ageing¹.

Chronic stress, inflammation and metabolic instability can accelerate telomere shortening³. You cannot stop this process. But you can influence its pace.

 

3. Epigenetic Alterations

The Volume Controls on Your Genes Shift

Your genes are not fixed switches. They are adjustable. Epigenetics determines which genes are turned up or down. Ageing changes this regulation¹.

Sleep, nutrition, stress and movement influence epigenetic signalling⁴. Your daily behaviour alters how your genes are expressed.

4. Loss of Proteostasis

The Cell’s Quality Control System Weakens

Cells constantly build, fold and recycle proteins. With age, this system becomes less efficient¹. Damaged or misfolded proteins accumulate. This contributes to neurodegenerative disease and cellular dysfunction. Healthy metabolism supports protein regulation.

 

5. Mitochondrial Dysfunction

Your Energy Production Becomes Less Efficient

Mitochondria convert nutrients into energy. With age, they produce energy less efficiently¹. This leads to:

• fatigue
• reduced exercise tolerance
• slower recovery
• increased oxidative stress

Regular exercise improves mitochondrial function⁵. Sedentary living accelerates decline.

 

6. Cellular Senescence

Some Cells Stop Dividing but Don’t Die

Senescent cells are cells that no longer divide but remain active. They release inflammatory signals. In small numbers, they are protective. In excess, they promote chronic inflammation².

Ageing increases the burden of senescent cells.


7. Stem Cell Exhaustion

Your Repair Reserve Gradually Shrinks

Stem cells regenerate damaged tissue. With age, stem cell pools decline¹. Repair slows. Tissues regenerate less efficiently. Metabolic health influences how rapidly this exhaustion occurs.


8. Dysregulated Nutrient Sensing

Your Cells Misinterpret Energy Signals

Cells constantly monitor nutrients through pathways like insulin and mTOR. When these pathways remain chronically elevated — particularly through insulin resistance — ageing accelerates¹³.

Stable glucose regulation protects this system. Overnutrition destabilises it.


9. Chronic Inflammation

A Persistent Low-Level Immune Activation

Ageing is associated with low-grade inflammation, sometimes called “inflammaging”². It is not dramatic inflammation. It is background signalling. Drivers include:

• visceral fat
• poor sleep
• gut barrier dysfunction
• metabolic instability

Inflammation amplifies nearly every other hallmark.

10. Altered Microbiome

The Community of Gut Bacteria Changes

The gut microbiome shifts with age². Diversity often declines. Lower diversity is associated with:

• metabolic dysfunction
• immune imbalance
• increased inflammation

Dietary fibre supports microbial diversity and short-chain fatty acid production⁶. The gut is not separate from ageing. It participates in it.


11. Impaired Autophagy

The Cell’s Recycling System Slows Down

Autophagy is how cells break down damaged components and reuse them. With age, autophagy becomes less efficient¹. Exercise and metabolic rest stimulate this recycling process⁵. Without recycling, cellular clutter accumulates.


12. Altered Intercellular Communication

Cells Send Distorted Signals

Cells constantly communicate. With age, signalling becomes noisy and less coordinated¹.

Inflammatory signals rise. Hormonal rhythms weaken. The body becomes less synchronised. Stable circadian rhythm supports signal clarity.


13. Extracellular Matrix Dysregulation

The Structural Scaffold Becomes Stiffer

The extracellular matrix is the structural network surrounding cells. With age, collagen cross-linking increases and tissues lose elasticity².

This contributes to:

• vascular stiffness
• reduced tissue resilience
• slower healing

Glycaemic instability accelerates this stiffening³.


14. Disabled Macroautophagy & Chronic Stress Response Activation

The Body Remains in Defensive Mode

The updated framework recognises that stress response systems become chronically activated with age². Cells stay in a protective posture. Energy is diverted toward defence rather than repair.

Chronic psychological stress feeds into this process⁴. Ageing is not only structural. It is regulatory.

Why This Framework Matters

The hallmarks are interconnected.

Metabolic instability worsens inflammation. Inflammation accelerates mitochondrial dysfunction. Mitochondrial dysfunction increases DNA damage. DNA damage promotes cellular senescence.

Ageing is not a straight line. It is a network. But many of these processes respond to lifestyle inputs:

Exercise improves mitochondrial efficiency⁵.
Stable glucose reduces nutrient signalling dysregulation³.
Fibre supports microbiome stability⁶.
Sleep regulates inflammation.
Stress management influences gene expression⁴.

You cannot stop ageing.

But you can influence its trajectory. Longevity is not about reversing time. It is about preserving biological efficiency for longer. That is the work.


References

¹ López-Otín, C., Blasco, M.A., Partridge, L., Serrano, M. and Kroemer, G., 2013. The hallmarks of aging. Cell, 153(6), pp.1194–1217.
https://doi.org/10.1016/j.cell.2013.05.039

² López-Otín, C., Blasco, M.A., Partridge, L., Serrano, M. and Kroemer, G., 2023. Hallmarks of ageing: an expanding universe. Cell, 186(2), pp.243–278.
https://doi.org/10.1016/j.cell.2022.11.001

³ Reaven, G.M., 1988. Banting lecture 1988: role of insulin resistance in human disease. Diabetes, 37(12), pp.1595–1607.
https://doi.org/10.2337/diab.37.12.1595 

⁴ Navakkode, S. and Kennedy, B.K., 2024. Neural ageing and synaptic plasticity: prioritising brain health in healthy longevity. Nature Reviews Neuroscience, 25(2), pp.79–94.
https://doi.org/10.3389/fnagi.2024.1428244 

⁵ Richter, E.A. and Hargreaves, M., 2013. Exercise, GLUT4, and skeletal muscle glucose uptake. Physiological Reviews, 93(3), pp.993–1017.
https://doi.org/10.1152/physrev.00038.2012

⁶ Tan, J., McKenzie, C., Potamitis, M., Thorburn, A.N., Mackay, C.R. and Macia, L., 2014. The role of short-chain fatty acids in health and disease. Advances in Immunology, 121, pp.91–119.
https://doi.org/10.1016/B978-0-12-800100-4.00003-9

 

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What Rhestores It Movement increases insulin sensitivity and enhances glucose transport⁴.Resistance training increases muscle mass — expanding the metabolic reservoir.Interrupting prolonged sitting improves postprandial glucose handling⁵.Allowing insulin to fall between meals restores access to stored fat². None of these are extreme. They are structural. They widen the metabolic range again. The Real Meaning of Flexibility Metabolic flexibility is not a trend. It is a capacity. A flexible system can tolerate variation without breakdown.An inflexible system strains under minor perturbation. This is why some people feel stable skipping a meal, while others become shaky and irritable. It is why some recover quickly after indulgence, while others experience prolonged dysregulation. The difference is not moral. It is metabolic. And it is modifiable.   Why It Matters Over Decades When fuel switching narrows, insulin burden rises. When insulin burden rises, adiposity increases. 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