What Affects Your Biological Age? The 12 Lifestyle and Medical Factors That Move the Needle

Chronological age counts the years since you were born. Biological age reflects how well your immune system is actually coping with the stresses of daily life, and it can run years ahead of or behind the number on your birth certificate. Several methods attempt to measure it: epigenetic clocks look at chemical changes to DNA, while glycan-based tests such as GlycanAge measure immune function and chronic inflammation directly. Understanding what affects biological age means looking at both the lifestyle choices you control day to day and the underlying medical factors worth monitoring with a professional, since the right intervention depends entirely on which factors are driving your result. None of these factors act alone: they interact and compound, which is why a single habit change rarely tells the whole story. Below is a 12-factor checklist covering both.

"I'm a doctor who has moved from prescribing pills to prescribing lifestyle. I measure biological age in all of my clients now, because having accurate, personalised data is what drives lasting change."

— Dr Alka Patel, GP and Lifestyle Medicine Doctor

Before you work through the checklist, it's worth understanding how biological age testing itself works. Our complete guide to biological age testing covers what these tests actually measure, how results are calculated, and what to look for when choosing one.

Lifestyle factors you control every day

1. Movement and exercise intensity

Exercise is essential, but more is not always better. Over-exercising places the body under additional stress and can itself accelerate biological ageing. High-intensity training isn't required for most people: moderate activity such as walking, yoga or pilates is often enough, especially for anyone already under stress from daily life. People who train intensively around a demanding work schedule can be surprised to see a higher GlycanAge than expected, since back-to-back stress leaves little time for proper recovery. The right intensity varies by person, which is why our guides to exercise in moderation and why overtraining can age you are worth reading before increasing training load.

2. Nutrition and caloric balance

Diet quality matters as much as diet restriction. Severe under-eating, particularly of carbohydrates and fats, can be just as damaging as overeating, and is often associated with heightened stress, anxiety, digestive issues, fatigue, poor sleep and difficulty concentrating. Prolonged under-fuelling also raises the risk of osteoporosis and affects skin and hair health, partly through reduced collagen production needed for skin cell regeneration. Research on structured caloric restriction shows it measurably shifts IgG glycosylation toward a healthier pattern, and prioritising phytonutrient-dense whole foods rather than blanket restriction is more consistently linked to healthier biological ageing than fad or elimination diets. Our anti-ageing diet guide covers this balance in more detail.

3. Sleep architecture

Poor sleep quality and disrupted sleep architecture, not just total hours, are consistently linked to higher inflammation and faster immune ageing. Fragmented deep sleep raises cortisol and disrupts the body's overnight repair processes, so prioritising consistent sleep timing and depth is one of the simplest levers available.

4. Stress and mental health

Chronic work stress is physical, not just psychological: it changes hormone levels in the body, which in turn affects gene expression and the molecules that regulate body mechanisms and metabolism. Monitoring your stress levels, and seeking support if they stay persistently high, matters as much as monitoring any other biomarker. Our breakdown of how stress ages the immune system explains the mechanism in more detail.

"I can see clearly that emotional stress can elevate your GlycanAge. It's a signal to reflect on and ask what you can change, because it's impacting your health. The results show me that, and it excites me to act."

— Dr Nick Engerer, Founder of A Longer Life

5. Alcohol and smoking

Smoking and excessive alcohol intake remain two of the most well-established accelerators of biological ageing, placing direct oxidative stress on cells and tissues over time and compounding the effects of the other factors on this list.

6. Environmental exposures

Everyday exposure to air pollution and irritants adds to the body's overall inflammatory load over time, alongside the other factors on this list. The evidence on specific environmental triggers such as UV exposure is still developing, so we have kept this entry general pending stronger data.

Medical and biological factors to monitor

7. Hormonal balance

Hormonal shifts, especially during menopause, have a measurable effect on biological age. Oestrogen has a protective effect on the immune system, and its decline after menopause changes glycan patterns toward a more pro-inflammatory profile. Hormone replacement therapy can help restore some of this balance, though there are natural limits to how far biological age can be shifted. Our guides to how hormones slow biological ageing and menopause and biological age explore this further.

"We've known for a long time the dangers of low oestrogen. When oestrogen levels are low or non-existent, we get this pro-inflammatory state, and that's linked to many of the chronic diseases we see after menopause."

— Dr Louise Newson, GP and Menopause Specialist, Founder of Newson Health

8. Chronic inflammation

Low-grade, persistent inflammation, often called inflammaging, is one of the strongest drivers of accelerated biological age. It builds silently over years, which is why it is frequently missed by standard check-ups and only shows up once symptoms, or an elevated biological age result, appear.

9. Gut microbiome health

A diverse gut microbiome supports immune regulation and lower systemic inflammation. Restrictive eating patterns that limit food variety can reduce microbial diversity, indirectly affecting how fast the immune system ages, which is another reason extreme or elimination diets tend to backfire.

10. Existing chronic conditions

Underlying conditions such as metabolic disorders or autoimmune disorders place ongoing demand on the immune system and are a recognised driver of accelerated biological age, making regular monitoring particularly useful for anyone managing a long-term condition.

11. Genetic predisposition and family history

Family history of chronic disease shapes baseline risk, though it is not the whole picture: lifestyle and medical factors still meaningfully influence how that genetic risk plays out in practice.

12. Regular biomarker monitoring

None of these factors can be managed effectively without visibility. A biological age test such as GlycanAge measures how these lifestyle and medical factors are combining in your immune system, using a simple finger-prick sample. Retesting every 6 to 12 months after a lifestyle change shows whether it is actually working, rather than relying on how you feel alone.

Treat this checklist as a starting point for a personalised approach rather than a one-size-fits-all rulebook. GlycanAge testing gives you a measurable baseline, so you can see which of these twelve factors matter most for your body and track whether the changes you make are moving the needle over time.

Ready to see where you stand? Order your GlycanAge test and get a measurable baseline for your own biological age, then use this checklist to work out what's worth changing first.

External sources

• Deriš H, Tominac P, Vučković F, Briški N, Astrup A, Blaak EE, Lauc G, Gudelj I. Effects of low-calorie and different weight-maintenance diets on IgG glycome composition. Front Immunol. 2022;13:995186. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9535357/