Aging effects are not the same for everyone. Some people remain healthy and active even after the age of 70, while others may develop age-related health problems much earlier. Because of these differences, scientists are trying to understand how the body actually ages.
A recent study suggests that a blood-based biological clock may help predict how fast a body is aging and how long it might live. Researchers found that a few blood measurements can estimate biological age and identify the risk of frailty and mortality.
This discovery could eventually help doctors better understand aging and provide more personalized healthcare.
What Is a Blood-Based Biological Clock?
It is a scientific tool that estimates a person’s biological age using blood biomarkers. Biological age is different from chronological age. Chronological age tells you how many years a person has lived. However, biological age actually reflects how healthy and well-functioning the body is.
This biological clock helps scientists measure these differences.
- Two people may both be 70 years old.
- One may have strong health and energy.
- The other may suffer from multiple age-related diseases.
Why Scientists Are Studying Biological Age
Understanding biological age is important because it can reveal how aging is affecting the body internally. Earlier research developed biological clocks based on DNA changes, but those tests can be expensive and difficult to use in everyday healthcare settings.
Scientists began looking for a simple way to solve this problem, creating a blood-based biological clock using routine blood tests. These blood tests are already commonly performed during regular health checkups, making the method more practical for real-world medical use.
How Researchers Developed the Biological Clock
Scientists from the National Institute on Aging (NIA) worked with researchers from the Jackson Laboratory in Maine and Indiana University School of Public Health.
They analyzed health data from thousands of laboratory mice over time. Using machine learning, the researchers developed an algorithm that predicts biological age from 10 health measurements. By analyzing these markers together, the system can estimate how quickly the body is aging.
Many of these measurements are already part of routine blood tests, including:
- Body weight
- Fasting blood glucose
- Complete blood count (CBC) results
- Other common blood biomarkers
What the Study Found
After building the biological clock, researchers tested how accurately it could predict health outcomes in mice.
They compared two important values:
- Actual age of the mouse
- Biological age predicted by the Blood-Based Biological Clock
The difference between these numbers is called the ‘aging gap.’
Key findings
In simple terms, the blood-based clock could help identify which animals were aging faster than others.
- Mice with a larger aging gap were aging faster than expected.
- These mice had a higher risk of frailty.
- They were also more likely to have a shorter lifespan.
Why This Research Is Important
This research shows that a blood-based biological clock could become a practical tool for healthcare. If similar models are successfully developed for humans, doctors may be able to:
- Detect early signs of accelerated aging
- Identify patients at higher risk of age-related diseases
- Personalize treatment plans
- Monitor the effects of lifestyle changes or therapies
Because the model relies on routine blood tests, it could be easier and more affordable to use in clinical settings.
Could This Work for Humans in the Future?
The current research was conducted in mice, but scientists designed the study carefully to increase the chances that it could be applied to humans. The biomarkers used in the study are commonly measured during human health checkups, which makes future translation more realistic.
Researchers are now working on developing human-based biological clocks using similar data. If successful, this approach could transform how doctors evaluate aging and long-term health risks.
The Future of Blood-Based Biological Clocks
The idea of measuring biological age is becoming an important area of aging research. In the future, it could help clinicians understand how aging affects each patient differently. Instead of relying only on chronological age, doctors may be able to make decisions based on how quickly a person’s body is actually aging.
This could help in earlier interventions, for better prevention strategies, and improved healthy aging outcomes.
Research Reference
Martinez-Romero J, et al. A hematology-based clock derived from the Study of Longitudinal Aging in Mice to estimate biological age. Nature Aging. 2024;4(12):1882-1896. doi:10.1038/s43587-024-00728-7.
