How to Measure Your Biological Age with Biomarkers
What is the difference between chronological and biological age?
Chronological age is the number of years since you were born. Biological age is an estimate of how old your body is, based on biological markers. Two 45-year-olds can differ by several years in biological age, depending on genes, lifestyle and health history.
What are biomarkers?
Biomarkers are measurable signals that reflect biological processes in the body, such as inflammation, blood sugar control or changes to DNA. In ageing research they are used to estimate biological age and disease risk before symptoms appear.
What is an epigenetic clock?
An epigenetic clock estimates age from DNA methylation patterns, small chemical tags on DNA that change with age. The Horvath clock, one of the best known, uses 353 methylation sites and estimates age across many tissues with high accuracy (Horvath, Genome Biology 2013). The gap between epigenetic and chronological age is often called age acceleration.
Does telomere length show health risk?
Telomeres are protective caps on chromosomes that shorten each time a cell divides. In people aged 60 and over, shorter blood telomeres were linked to higher mortality, especially from heart disease and infection (Cawthon et al., Lancet 2003). Telomere length varies a lot between people, so a single result cannot be read on its own.
Why does hs-CRP matter?
hs-CRP measures chronic low-grade inflammation, one of the hallmarks of ageing. In a study of almost 28,000 women, CRP predicted cardiovascular events better than LDL cholesterol (Ridker et al., N Engl J Med 2002). The test is cheap and widely available.
Which biomarkers can you test?
| Biomarker | What it measures | How to test | Note |
|---|---|---|---|
| Epigenetic clock | DNA methylation patterns | Specialised lab test from blood or saliva | Closest to "biological age"; limited availability |
| Telomere length | Protective chromosome caps | Specialised blood test | Large variation between people; trends beat single values |
| hs-CRP | Low-grade inflammation | Routine blood test | Cheap and widely available |
| HbA1c and fasting glucose | Blood sugar control | Routine blood test | Diabetes risk markers |
| Lipid profile | Cholesterol and triglycerides | Routine blood test | Heart risk markers |
Can biological age be improved?
The strongest evidence is for the basics: enough sleep, regular exercise, a healthy diet, managing stress and social connection (see 5 daily habits). Research on supplements and peptides for improving biomarkers is early and mostly untested in humans, so it cannot be promised.
How to start tracking your biomarkers
- Start with widely available routine blood tests: hs-CRP, HbA1c, fasting glucose and a lipid profile.
- Repeat them at the same interval, for example every 6 to 12 months, and compare the trend.
- Discuss results with a doctor, especially values outside the normal range.
- Treat epigenetic clock tests as a complement, not a diagnosis.
Where can you get biomarker tests and what do they cost?
Routine blood tests such as hs-CRP, HbA1c, fasting glucose and a lipid profile are available at most clinical labs in Indonesian cities, usually without a doctor's referral. Epigenetic clock and telomere tests are much rarer, usually sent to specialist labs, and cost far more.
For most people, a routine blood panel repeated regularly gives a useful picture at an affordable price.
How to read your results correctly
- Compare with the lab reference range printed on the result.
- Look at trends across several tests, not one number. A mild infection can raise hs-CRP for a while.
- Repeat tests under the same conditions, for example in the morning and fasted for glucose and lipids.
- Do not change treatment based on one test; talk to a doctor.
Frequently asked questions
Which test is most accurate for biological age?
DNA-methylation epigenetic clocks are currently the most studied estimate of biological age, but they are still research tools, not diagnoses.
What is a normal hs-CRP level?
Generally under 1 mg/L is considered low risk and over 3 mg/L high risk, but follow your lab reference range.
How often should you test biomarkers?
For healthy adults, every 6 to 12 months is enough to see trends.
Can telomeres be lengthened?
Research has not shown a proven way to lengthen telomeres in humans; healthy lifestyles are linked to slower shortening.
Can peptides lower biological age?
There is no human evidence yet. Research on peptides and ageing biomarkers is mostly in animals and cells.
