Imagine this pitch: a simple cheek swab or blood spot mailed from home tells you not your birthday but your “true” biological age – the number that supposedly reflects your real health trajectory. Patients increasingly walk into clinics clutching these reports, convinced they’ve discovered the secret to their future.
It’s an appealing idea. Aging is the single biggest risk factor for Alzheimer’s, heart disease, cancer, and nearly every chronic illness. If you could measure aging, track it, and reverse it, who wouldn’t want that?
Here’s the problem: today’s so-called “biological age” tests don’t measure what they claim, and when clinicians use them, they aren’t practicing cutting-edge medicine. They’re practicing bad medicine.
What These Tests Actually Do
Most “biological age” tests rely on epigenetics, chemical marks on DNA that change over time. Algorithms trained on these patterns can predict chronological age or, with later-generation clocks, correlate with mortality or disease risk. In research, these tools are valuable for studying how biology shifts across the lifespan.
But they don’t measure biological age. They measure DNA methylation status, which is correlated with chronological age (or disease risk or mortality), each of which is, in turn, correlated with biological age. Biological age tests are, at best, correlations to correlations. More importantly, outside of controlled research, their accuracy and precision are unknown.
Why Consumer Epigenetic Tests Fall Short
Despite these limits, direct-to-consumer companies continue selling epigenetic age tests, complete with glossy marketing and false promises to reveal your “true age” or “exact rate of aging.” In some cases, aggressive sales tactics have been employed to trick physicians, who may not understand the underlying biology or statistics, into believing these tests accurately measure something relevant for human health. This is bad enough, but many companies don’t stop there. The results are often packaged with supplement regimens, pitched as if the test could tell you which pills “work” for your biology.
This isn’t just misleading, it’s dishonest. The tests cannot measure biological age, let alone determine which supplement changes it. Yet, the business model depends on creating anxiety with a number, then selling the supposed solution right alongside it. It’s a bait-and-switch dressed up as personalized medicine.
Here are the problems:
- Unreliable results. In my own experiment, the same sample sent to the same company produced biological age estimates nearly 15 years apart. Across multiple companies, the discrepancies were even larger.
- No quality standards. Unlike diagnostic labs, no one monitors these tests for accuracy or consistency. A CLIA certification may ensure general lab competence, but it doesn’t validate the test itself.
- No clinical use. Unlike blood pressure, cholesterol, HbA1c, or VO₂max, these tests provide no actionable information. Even if accurate, they would at best show whether your trajectory is improving or declining without providing any information about cause and effect. But they aren’t accurate, and we already have far better ways to track health.
Why Providers Should Say No
Some clinicians justify offering these tests by saying, “My patients want them.” That’s not medicine. That’s customer service.
Good medicine requires three things of any diagnostic or screening tool:
- Understanding the precision (what is the error in the measurement itself).
- Knowing its accuracy (how close does it get to the true value).
- Using it to guide care.
Epigenetic age tests fail on all three counts. Handing a patient a PDF with a “biological age” number is no different than giving them a horoscope. Worse, it risks replacing evidence-based care with false reassurance or unnecessary fear.
The idea that “we don’t have anything better” is flat wrong. We already have outstanding tools: glucose, insulin, lipids, DEXA, cardiac scans, VO₂max, strength and agility tests, cognitive assessments… the list goes on and on. They’re reliable, affordable, actionable, and predictive of real outcomes.
The Bigger Risk
Longevity science and medicine geared toward maximizing healthspan are entering a golden age. We’re learning more about the biology of aging than ever before, and legitimate interventions are on the horizon, but hype and pseudoscience threaten to undermine that progress.
If physicians start recommending unvalidated, inaccurate, and non-actionable tests, we don’t just mislead patients, we damage the credibility of the entire field.
Providers: you are the gatekeepers. Your role is not to indulge every consumer fad. It’s to guide patients with evidence, even when that means saying no.
Healthspan medicine can and should become a respected clinical discipline, but only if we demand rigor, honesty, and integrity – starting with the tests we choose to use.
View the article at lifespan.io
