You Might Be Older Than You Think
Many people regard their chronological age as a reflection of their life, but it doesn’t always align with their body’s biological clock. In essence, while your chronological age counts the years since your birth, your biological age gauges your body’s wear and tear on a cellular level.
This divergence can occur due to various factors including genetics, lifestyle choices, and medical history. According to Dr. Douglas Vaughan, director of the Potokusnack Institute on Longevity at Northwestern University’s Feinberg School of Medicine, your biological age might be older or younger than your chronological age. These two indicators can progress at different rates.
As Vaughan explains, “Every birthday adds another year to your life. We all experience it at the same rate—it’s relentless and indifferent.” In contrast, biological age, or epigenetic age, reflects more nuanced changes within the body over time.
Researchers have established various techniques to estimate biological age, including the epigenetic clock, which involves analyzing DNA changes at the molecular level. Initially developed for clinical research, these tools are now being commercialized and marketed directly to consumers.
Biological age testing kits are increasingly available online, with prices ranging from $299 for saliva tests to $499 for blood tests. Nonetheless, potential buyers should exercise caution, as not all tests deliver equal accuracy or insights into health.
Understanding the Epigenetic Clock
The epigenetic clock operates on algorithms derived from DNA methylation, likened to a dimmer switch that regulates gene expression. Daniel Belsky, an associate professor of epidemiology at Columbia University’s Robert N. Butler Columbia Center on Aging, explains that these clocks, while informative, largely function as statistical tools rather than biological references.
Different epigenetic clocks serve varied purposes. For example, PhenoAge estimates biological age, while GrimAge predicts a person’s mortality risk within a year. Belsky played a role in developing another clock, DunedinPACE, which measures the rate of biological aging and is currently exclusively licensed to TruDiagnostic.
“We’re aiming to distinguish between speedometers and odometers when it comes to aging measurements,” Belsky says. In this analogy, the odometer shows your biological age, while DunedinPACE indicates the speed at which you’re aging; a score of 1 reflects average aging, while a score below 1 suggests you’re aging more slowly.
Biological Age Represents a Single Snapshot
Steve Horvath, a pioneer in the development of saliva-based epigenetic clocks, created the first of its kind in 2011. Although this initial clock received a U.S. patent, Horvath acknowledges that it has not been widely adopted. His later innovations, including the Horvath Clock and PhenoAge, have brought biological testing closer to mainstream applications.
Horvath’s focus remains primarily on lab use, but he envisions a future where these tests become commonplace in routine health assessments. Nevertheless, he cautions that clinical validation is still catching up with the science and that significant research is ongoing.
Christopher Hein, a principal investigator at Cleveland Clinic Research, emphasizes that biological age serves as a multidimensional measure of health status. It assesses various systems, including metabolism and bone density, allowing for a deeper understanding of both life expectancy and healthy life expectancy.
Evaluating Biological Age in Context
Hein predicts that biological age testing will find broader applications in medicine soon; however, it’s essential to note that these tests are not meant for diagnosing diseases. For instance, a healthy individual shocked to discover their biological age is five years higher than their chronological age may feel compelled to change their lifestyle drastically.
Vaughan adds that while chemical alterations in DNA can sometimes be modified—like how smoking hastens biological aging—individuals should carefully consider test outcomes. Belsky warns that inconsistencies among epigenetic clocks necessitate cautious interpretation of results.
Chronological age remains one of the strongest predictors of disease risk, and Vaughan believes biological age may surpass it in predictive capability. “We’ve sharpened our understanding of what predisposes individuals to various health issues as they age,” he states, yet he cautions that relying solely on biological age could yield misleading conclusions.
To avoid misinterpretations, Vaughan urges a holistic assessment of health markers beyond biological age alone. “When a test suggests your biological age is significantly younger than your chronological age, it’s an intriguing conversation starter. But questions like your cholesterol levels or blood pressure are paramount,” he concludes.
