Biological Age Clocks: Separating Signal from Noise

Human Sync Co-Founder and Clinical Director Erik Nelson brings together two of the most credible voices on opposite sides of the biological age clock debate. Dr. Matt Kaeberlein, CEO of OptiSpan, 25-year aging researcher, and co-founder of the Dog Aging Project, has publicly questioned whether direct-to-consumer biological age tests are ready for clinical use. Matt Dawson, CEO of TruDiagnostic, physician, and co-founder of Wild Health, has built one of the most advanced epigenetic testing platforms in the world and believes select clocks are already clinically useful. They agree on far more than they disagree, and that tension is exactly what makes this conversation worth hearing. Erik walks them through what biological age actually is, why you likely can't measure it directly, the difference between first-generation clocks and newer tools like Dunedin PACE, what separates a useful biomarker from noise, reproducibility and real-world variability, response to interventions, FDA pathways, life insurance implications, and where the science needs to go next. This is the kind of conversation that moves the field forward.