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You've probably heard someone say they feel younger than their age. As it turns out, that's not just a feeling — it's measurable biology.
There's a growing distinction in longevity science between two very different numbers: the age on your birth certificate, and the age your body is actually operating at. One you can't change. The other, increasingly, you can.
Chronological age vs biological age
Chronological age is simply how long you've been alive. Biological age — sometimes called physiological age — is a measure of how well your body's cells, tissues, and systems are actually functioning relative to what's typical for your years.
Two people who are both 45 can have biological ages that differ by a decade or more. One might have the cellular profile of a 38-year-old. The other might already be showing the cellular hallmarks of someone in their mid-50s.
This matters because biological age is a better predictor of health outcomes than chronological age. It's more closely linked to risk of chronic disease, cognitive decline, and how long you're likely to live in good health — what researchers call healthspan.
How is biological age measured?
The most established method uses something called an epigenetic clock. Your DNA doesn't just carry your genetic code — it also carries chemical tags called methylation marks that change in predictable patterns as you age. Scientists can analyse these patterns to estimate how old your cells are behaving.
The most widely cited of these is the Horvath Clock, developed by UCLA professor Steve Horvath, which examines methylation patterns across hundreds of sites in the genome. More recent versions — including the GrimAge and DunedinPACE clocks — have become even better at predicting mortality and the rate at which someone is ageing.
Other markers researchers use to estimate biological age include:
- Telomere length — the protective caps on chromosomes that shorten with each cell division and with oxidative stress
- Inflammatory biomarkers — particularly CRP (C-reactive protein), IL-6, and TNF-α, which rise chronically with age
- Metabolic markers — fasting glucose, insulin sensitivity, and lipid profiles
- Physical performance — grip strength, VO2 max, and walking speed all correlate with longevity outcomes in population studies
Consumer tests using saliva or blood samples now allow individuals to get a rough biological age estimate — though the science is still maturing, and results should be read as indicators rather than definitive verdicts.
What drives biological ageing faster?
Biological age isn't fixed. Certain factors accelerate it — pushing your cellular age ahead of your years:
- Chronic inflammation — low-grade, persistent inflammation damages cells and tissues over time and is one of the most reliably replicated drivers of biological ageing
- Oxidative stress — an imbalance between free radicals and the body's ability to neutralise them, which accelerates cellular damage
- Mitochondrial decline — the energy-producing structures in your cells become less efficient with age, reducing cellular function across the body
- Poor metabolic health — chronic blood sugar dysregulation causes glycation damage to proteins and DNA
- Sleep deprivation — consistently poor sleep is associated with accelerated telomere shortening and elevated inflammatory markers
- Chronic psychological stress — studies show high stress is associated with shorter telomeres and faster epigenetic ageing
Can you reverse it?
This is where the research gets genuinely interesting.
A landmark 2021 study published in Aging Cell — the TRIIM-X trial — found that a combination of growth hormone, DHEA, metformin, and zinc reversed epigenetic age by an average of 2.5 years over 12 months. Crucially, the reversal persisted after the trial ended.
More accessibly, a 2023 study in Nature Aging found that an 8-week lifestyle intervention — combining diet, sleep optimisation, stress management, and targeted supplementation — reduced biological age by an average of 3.23 years.
The specific interventions with the strongest evidence for slowing or partially reversing biological ageing include:
- Reducing chronic inflammation — through diet, targeted nutrition, and reducing inflammatory load
- Protecting mitochondrial function — CoQ10, alpha lipoic acid, and adequate B vitamins all play a role here
- Antioxidant support — neutralising the oxidative stress that accelerates telomere shortening and cellular damage
- Maintaining insulin sensitivity — stable blood sugar is consistently associated with slower biological ageing
- Consistent, adequate sleep — one of the most powerful and underused longevity tools available
- Exercise — particularly resistance training and zone 2 cardio, both associated with reduced epigenetic age
The honest answer is: full reversal is not yet achievable through lifestyle alone. But meaningful slowing — and in some cases partial reversal — increasingly appears to be within reach, particularly when interventions address the upstream biological drivers rather than individual symptoms.
What this means in practice
The shift from thinking about age as a fixed number to a malleable biological state is one of the most important reframings in modern health. It moves the conversation from inevitable decline to active management.
You can't control when you were born. But the research increasingly suggests you have more influence over your biological age — and therefore your long-term health — than most people realise.
That influence starts at the cellular level: with inflammation, oxidative stress, mitochondrial function, and metabolic health. Address those systems consistently, and the biology tends to follow.
How AEVUM's Daily Vitals Longevity Complex supports healthy biological ageing
AEVUM's Daily Vitals Longevity Complex was formulated around the five biological systems that research consistently identifies as central to how well we age — Inflammation balance, cellular resilience, metabolic health, energy production, and nervous system regulation.
- HydroCurc® (curcumin) helps modulate NF-κB — the master regulator of inflammatory gene expression — while also supporting BDNF, a key marker of brain resilience.
- Levagen+® (PEA) addresses inflammation at a localised, cellular level and has been shown in clinical trials to reduce inflammatory cytokines. Together, they target the chronic, low-grade inflammation that accelerates biological ageing.
- Astaxanthin, Alpha lipoic acid, Vitamin C, and Zinc form a coordinated antioxidant network — protecting cells across different environments and regenerating each other to provide broader coverage than any single antioxidant could.
- CoQ10 and Vitamin B1 support energy production from a cellular level, powering the mitochondrial process that slows predictably with age.
- Chromium picolinate and Resveratrol address the metabolic health dimension — insulin sensitivity, glucose regulation, and sirtuin pathway activation.
This isn't ten ingredients assembled at random. It's a formula designed around the biology of ageing.
References
Horvath, S. (2013). DNA methylation age of human tissues and cell types. Genome Biology, 14(10), R115.
Fahy, G.M. et al. (2021). Reversal of epigenetic aging and immunosenescent trends in humans. Aging Cell, 20(4).
Fitzgerald, K.N. et al. (2023). Potential reversal of epigenetic age using a diet and lifestyle intervention. Nature Aging.
López-Otín, C. et al. (2013). The hallmarks of aging. Cell, 153(6), 1194–1217.
Blackburn, E.H. & Epel, E.S. (2017). The Telomere Effect. Grand Central Publishing.
