Biological Age

What is Biological Age?

Biological age, also known as physiological age or functional age, is a measure that aims to quantify the actual aging status of an individual's body at a molecular and cellular level. Unlike chronological age, which is simply the number of years since birth, biological age reflects how well the body's systems are functioning and how much 'wear and tear' they have accumulated. It is often calculated using algorithms that integrate data from various biomarkers, reflecting the pace of aging processes.

How is Biological Age calculated?

f(Biomarkers, Epigenetic Signatures, Clinical Data)

Inputs: multiple physiological and molecular markers

Biological age is a conceptual measure that reflects an individual's functional and molecular age, which may differ from their chronological age. It is typically calculated using algorithms that integrate data from multiple biomarkers, including blood tests, genetic markers, and epigenetic signatures (like DNA methylation). Different algorithms or 'aging clocks' may use different sets of inputs and calculation methods, leading to variations in the specific 'biological age' reported.

What does Biological Age do in the body?

Aging is a complex biological process characterized by a progressive decline in physiological function and an increased risk of disease and mortality. While chronological age is a simple measure of time, biological aging involves the accumulation of cellular damage, telomere shortening, epigenetic alterations, and impaired tissue repair. Biological age attempts to capture the cumulative effect of these intrinsic and extrinsic factors on an individual's health trajectory, providing a more personalized measure of aging compared to chronological age alone.

What does a high Biological Age mean?

A biological age that is higher than one's chronological age suggests an accelerated rate of aging, potentially indicating a higher risk of age-related diseases and overall mortality.

Common causes:

• Chronic inflammation
• Poor lifestyle choices (e.g., smoking, excessive alcohol, sedentary lifestyle)
• Metabolic dysfunction (e.g., insulin resistance, type 2 diabetes)
• Chronic stress
• Environmental toxin exposure

What does a low Biological Age mean?

A biological age that is lower than one's chronological age suggests a slower rate of aging, potentially indicating better health and a reduced risk of age-related diseases.

Common causes:

• Healthy lifestyle (e.g., balanced diet, regular exercise, adequate sleep)
• Effective stress management
• Favorable genetic predispositions
• Absence of chronic diseases

What moves Biological Age apart from disease?

Lifestyle choices (diet, exercise, smoking, alcohol) either direction

Unhealthy habits tend to increase biological age, while healthy habits can lower it.

Chronic diseases (e.g., diabetes, cardiovascular disease) raises it

Presence of chronic health conditions often accelerates biological aging.

Stress and mental health raises it

Chronic psychological stress is associated with accelerated biological aging.

Environmental exposures (e.g., pollution, toxins) raises it

Exposure to environmental pollutants and toxins can contribute to cellular damage and accelerated aging.

Genetics either direction

Genetic predispositions can influence an individual's inherent rate of aging.

Which other tests are read together with Biological Age?

AGE_ACCEL_GRIM upstream

GrimAge is a specific epigenetic clock that calculates age acceleration, a measure related to biological age.

AGE_ACCEL_HORVATH upstream

Horvath Age Acceleration is another widely used epigenetic clock contributing to the understanding of biological age.

AGE_ACCEL_PHENOAGE upstream

PhenoAge Acceleration is an epigenetic clock derived from phenotypic biomarkers, providing insights into biological age.

DUNEDINPACE upstream

DunedinPACE measures the pace of aging over time, a dynamic aspect of biological age.

Fasting Plasma Glucose same panel

Fasting Plasma Glucose is a common biomarker included in some biological age calculations, reflecting metabolic health.

Glycated Hemoglobin (HbA1c) same panel

Glycated Hemoglobin (HbA1c) is a key metabolic marker often used in biological age models.

LDL Cholesterol same panel

LDL cholesterol is a lipid marker often considered in comprehensive biological age assessments.

CRP same panel

C-reactive protein is an inflammatory marker whose levels are often incorporated into biological age algorithms.

Which foods affect Biological Age?

• Antioxidant-rich foods (e.g., berries, leafy greens) — supports moderate evidence
• Omega-3 fatty acids (e.g., fatty fish, flaxseeds) — supports moderate evidence
• Fiber-rich foods (e.g., whole grains, legumes) — supports moderate evidence

Which supplements are studied for Biological Age?

NMN (Nicotinamide Mononucleotide) emerging evidence

NMN is a precursor to NAD+, a coenzyme crucial for cellular energy metabolism and DNA repair. Research suggests it may support healthy aging by boosting NAD+ levels. Typical doses vary in research and clinical settings; consult a healthcare professional for guidance.
Typical dose: no general dose given
Cautions: Limited long-term human data. Potential side effects are generally mild but may include nausea, diarrhea, or abdominal discomfort.

Resveratrol moderate evidence

Resveratrol is a plant compound with antioxidant and anti-inflammatory properties, known for activating sirtuins, proteins involved in cellular aging and metabolism. It may contribute to decelerated biological aging.
Typical dose: 150-500 mg daily
Cautions: May interact with blood thinners and other medications. High doses can cause digestive upset.

How does exercise affect Biological Age?

Aerobic exercise (e.g., brisk walking, jogging, cycling) strong evidence

How much: At least 150 minutes of moderate-intensity or 75 minutes of vigorous-intensity aerobic activity per week, as recommended by major health organizations.
What to expect: Regular aerobic exercise improves cardiovascular health, reduces chronic inflammation, and may slow biological aging by supporting telomere length and mitochondrial function.

Resistance training (e.g., weightlifting, bodyweight exercises) strong evidence

How much: 2-3 sessions per week, targeting all major muscle groups, as part of a comprehensive fitness program.
What to expect: Resistance training builds muscle mass and strength, which are vital for maintaining metabolic health and physical function, factors associated with a slower biological aging rate.

Which lifestyle factors affect Biological Age?

Sleep quality and duration strong evidence

Aim for 7-9 hours of high-quality sleep per night. Poor sleep can disrupt hormonal balance and increase inflammation, accelerating biological aging.

Stress management moderate evidence

Incorporate stress-reducing practices such as meditation, yoga, or spending time in nature. Chronic stress has been linked to accelerated cellular aging.

Social engagement and purpose moderate evidence

Maintain strong social connections and engage in activities that provide a sense of purpose. Social isolation and lack of purpose are associated with poorer health outcomes and faster aging.

How should you prepare for a Biological Age test?

• Follow specific instructions provided by the laboratory or healthcare provider regarding fasting or other preparations, as the underlying biomarkers used for calculation may require it.
• Be aware that different biological age tests or 'clocks' use varying methodologies and biomarkers, which can lead to different results. Consistency in testing method is important for tracking changes over time.

References

1. Levine, M. E., Lu, A. T., Quach, A., Chen, B. H., Assimes, T. L., Bandinelli, S., ... & Horvath, S. (2018). An epigenetic biomarker of aging for lifespan and healthspan. Aging (Albany NY), 10(4), 574. — https://doi.org/10.18632/aging.101414
2. Horvath, S., & Raj, K. (2018). DNA methylation-based biomarkers and the epigenetic clock theory of ageing. Nature Reviews Genetics, 19(6), 371-384. — https://doi.org/10.1038/s41576-018-0004-3