How fast is your body actually ageing? Biological age testing does not tell you how long you will live. What it offers is a clinically grounded view of how your body is ageing right now – and whether that path can be improved.
Most of us measure age the same way: by counting the years since we were born. But chronological age tells you very little about how your body is actually doing. Two women at 50 can have vastly different health status, different levels of energy, different risks of disease. The number is the same but the biology is not.
This is where biological age comes in.
What biological age actually means
Biological age is a measure of how quickly or slowly your body is ageing at a cellular level. Unlike chronological age, it can be influenced. Lifestyle, hormones, sleep, stress and exercise all affect how fast your cells age. So does genetics – but less than most people assume. Research suggests that genetics accounts for roughly 20 to 30 percent of how we age. The rest is shaped by factors we can actually do something about.
The challenge has always been measuring it accurately. Until recently, we had no reliable way to look inside the body and assess its biological tempo. That has changed.
The epigenetic clock
Epigenetic testing – specifically DNA methylation analysis – is currently the most validated method for measuring biological age. As we age, chemical markers attach to our DNA in predictable patterns. By analysing these patterns, scientists can estimate not just how old your cells are, but how fast they are ageing right now.
The Dunedin test, developed by researchers at Duke University, goes one step further. Rather than providing a static biological age, it measures your pace of ageing – how many biological years you are accumulating per calendar year. A score of 1.0 means you are ageing at an average rate. A score of 1.2 means your body is ageing 20 percent faster than average. A score of 0.8 means it is ageing slower.
This distinction matters. Knowing your current biological age is useful. Knowing how fast you are getting there is actionable.
Why it is particularly relevant for women
Women experience a biological shift in their forties that has no equivalent in men. As oestrogen and progesterone levels decline during perimenopause, the pace of cellular ageing accelerates. Studies show that this hormonal transition is associated with measurable changes in biological age markers – changes that are not inevitable, but that can be meaningfully influenced by early intervention.
Research published in 2025 found that menopausal hormone therapy was associated with reduced biological ageing across all groups studied, and that a woman's reproductive profile was a stronger predictor of ageing pace than previously understood. Early menopause, in particular, was associated with accelerated biological ageing.
In other words, the hormonal changes that many women are told to simply manage are leaving a measurable biological footprint. And that footprint can now be tracked.
What you can do with the information
A biological age test on its own is not a diagnosis. It is a data point – one that becomes significantly more useful when interpreted alongside other health markers, hormone levels, cardiovascular indicators and physical assessments.
What it provides is a baseline. A clear picture of where you are today, against which future measurements can be compared. If interventions are made – whether lifestyle changes, hormone therapy or other treatments – the effect on biological ageing pace can be tracked over time.
In summary
Biological age testing does not tell you how long you will live. What it offers is a clinically grounded view of how your body is ageing right now – and whether that path can be improved. For women navigating the hormonal changes of their forties and beyond, it is one of the most informative tools available for understanding what is actually happening inside the body, and what can be done about it.
Sources
Horvath S. DNA methylation age of human tissues and cell types. Genome Biology, 2013.
Belsky DW, et al. Quantification of biological aging in young adults. PNAS, 2015.
Ye Y, et al. Evaluation of reproductive profiles, epigenetic aging, and mortality in post-menopausal women. 2025.
Hannum G, et al. Genome-wide methylation profiles reveal quantitative views of human aging rates. Molecular Cell, 2013.
Oblander SA, et al. Biological aging and the hallmarks of aging. Nature Aging, 2023.
Bell CG, et al. DNA methylation aging clocks: challenges and recommendations. Genome Biology, 2019.
