Biological age, a term rapidly gaining traction in medical circles, is emerging as a powerful indicator for predicting health outcomes.
Unlike chronological age, which is simply the number of years lived, biological age refers to the condition and functionality of one’s cells, offering a more nuanced picture of how fast or slow a person is truly ageing.
Recent research published in Scientific Reports using data from the Framingham Offspring Study has thrown up compelling insights into the relationship between accelerated biological ageing and the risk of cardiovascular disease, mortality, and dementia.
The findings hold particular significance for women, with faster biological ageing linked to increased dementia risk only in female participants.
The concept of biological age is not new, but its application in clinical settings remains limited due to the absence of standardised calculation methods.
In this study, researchers estimated biological age using a combination of biomarkers, including total blood cholesterol, blood sugar levels, Mini-Mental State Exam scores, and others. Participants were grouped into three categories: accelerated, decelerated, or concordant biological age. Concordant individuals had a biological age roughly matching their chronological age, while accelerated and decelerated groups had higher or lower biological ages respectively.
Most participants were middle-aged adults with biological ages closely aligned to their chronological ages. However, those with accelerated biological ageing stood out. On average, men in this group appeared four years older biologically than their actual age, while women were 2.5 years older.
The study tracked these individuals for more than two decades—26 years for dementia and mortality outcomes, and 23 years for cardiovascular disease—offering a rare long-term perspective. During the follow-up period, 713 cardiovascular events, 1,105 deaths and 265 dementia cases were recorded.
The data painted a stark picture: participants with accelerated biological ageing faced substantially greater risks across the board. Cardiovascular disease risk increased by 1.6 times in men and 1.8 times in women compared to those with decelerated biological ageing. Mortality risk doubled for both sexes.
Strikingly, the dementia risk rose only for women with accelerated biological ageing—men did not show a statistically significant increase.
Sensitivity analyses reinforced these findings. Women with even concordant biological age faced higher dementia risk compared to those with decelerated ageing. This gender difference calls for further investigation into the mechanisms at play.
Despite these compelling associations, experts urge caution in interpreting the results. The study was observational, so it cannot establish causality. There is also the issue of residual confounding which are other factors not accounted for may have influenced outcomes. The calculation of biological age itself is subject to limitations; it acts as a proxy measure for ageing rather than a definitive gauge. Researchers acknowledge that additional biomarkers not included in their analysis could be more relevant to the ageing process. The predominantly white European descent of Framingham Offspring Study participants also narrows the generalisability of results.
A key critique from experts concerns the incremental value of biological age as a predictor when compared with established risk factors like chronological age, smoking status, blood pressure, diabetes, lipid levels and body mass index (BMI).
When biological age was added to prediction models already containing these variables, improvement was minimal, the change in the c-statistic ranged from nearly zero to about 0.01. This means that while biological age does track risk, it does not offer much beyond what traditional risk factors already reveal.
Nevertheless, experts see value in using biological age as a conversational tool. Framing health risks in terms of biological age may resonate more with patients than listing abnormal lab results.
Telling someone their body appears several years older than their actual age could motivate healthier behaviour changes such as controlling blood pressure or quitting smoking. Yet there is no specific therapy for accelerated ageing; treatment still focuses on the same components—managing blood pressure, cholesterol and diabetes, that have been targeted for decades.
The study authors suggest that measuring biological age could help identify individuals at higher risk for adverse outcomes not captured by single biomarkers alone. It may also drive efforts towards developing standards for calculating biological age, a step sorely needed before its routine use in clinical practice can be justified.
While this research shines a spotlight on the potential of biological age as a predictive tool, more work is needed. Factors contributing to accelerated biological ageing, such as education level, substance abuse history and environmental influences should be explored in greater depth. Understanding these contributors may guide interventions aimed at slowing the ageing process and reducing risks associated with accelerated ageing.
For now, experts advise caution before implementing major changes in clinical practice based on these findings. Biological age measurement is not yet ready to be used as a routine tool in clinics. Instead, it serves as an intriguing starting point for discussions about health risks and preventive strategies with patients.
Looking ahead, researchers anticipate that one day there will be a standardised and clinically validated definition of biological age that complements traditional measures of health and disease risk.
Such a measure could help clinicians identify people who are biologically ageing faster than expected and may be at greater risk for cardiovascular disease or other age-related conditions.
It could also assist in evaluating whether interventions such as exercise, improved diet, blood pressure control, cholesterol management, maintaining healthy weight or smoking cessation are influencing the underlying processes of biological ageing.
However, we are not yet at that point. The journey towards establishing reliable measurements of biological age and determining whether modifying these measures translates into better health outcomes is ongoing. More research will be necessary to move from proxy measures to actionable intelligence that can transform patient care.
The implications of this study are broad and significant. Accelerated biological ageing appears to be an important predictor of cardiovascular disease and mortality risk in both sexes, while its link to dementia seems unique to women. This gender difference underscores the complexity of ageing and disease mechanisms, prompting researchers to call for further studies examining sex-specific pathways.
The lack of standardisation in calculating biological age remains a barrier to widespread adoption. Different studies use varying combinations of biomarkers and methodologies, making comparisons difficult and limiting clinical utility. The medical community is likely to push for consensus on which biomarkers best capture the ageing process and how they should be weighted in calculations.
Another challenge lies in translating biological age measures into practical interventions. While it is compelling to inform patients their bodies are ageing faster than expected, there is no direct treatment for accelerated ageing itself.
Instead, clinicians must continue focusing on managing individual risk factors like blood pressure, cholesterol, and diabetes while encouraging lifestyle changes known to slow cellular ageing.
Experts believe that refining our understanding of what drives accelerated ageing will be key to future progress. Environmental exposures, socioeconomic status, educational attainment and lifestyle behaviours all appear to play roles in determining how quickly our bodies age at the cellular level.
Even as these findings spark interest and debate within the medical community, they highlight the importance of ongoing research into the biology of ageing. As populations around the world continue to live longer lives, understanding how and why some individuals age faster than others will be critical for improving health outcomes and quality of life.
For now, clinicians can use information about biological age as a tool for patient engagement—helping individuals understand their risks and motivating them towards healthier choices. Patients should be encouraged to focus on proven strategies such as regular physical activity, balanced diet, maintaining healthy weight, avoiding tobacco and excessive alcohol use, managing stress and monitoring blood pressure and cholesterol.
While the concept of biological age offers exciting possibilities for advancing preventive medicine and personalising care, it remains firmly rooted in research rather than routine practice—at least for now.
Continued exploration into its measurement and implications will be necessary before it can claim its place alongside traditional risk factors in guiding clinical decisions.
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