Scientist Challenges Foundation Of Anti-Aging Research: Are ‘Biological Age’ Tests Dangerously Misleading?

PHILADELPHIA — Many Americans have shelled out hundreds of dollars for biological age tests promising to reveal whether their bodies are aging faster or slower than their actual years. These methylation-based “aging clocks” have become the gold standard for evaluating anti-aging treatments, from supplements to lifestyle changes. But a controversial new paper argues these widely trusted tests might be fundamentally flawed — and potentially dangerous.

Testing Random Genetic Changes

To investigate whether aging-related methylation changes are truly random or directed by biological programs, Mitteldorf attempted to build a “stochastic methylation clock” based on genuine genetic drift.

Using a database of 278 individuals aged 2 to 92, he identified methylation sites that remained partially active throughout life but showed increasing random variation with age. These represented genuine drift rather than directed changes.

Only about 10% of subjects showed genuine random methylation drift above background noise. When Mitteldorf tried to build an aging clock from this truly random drift, it performed poorly, correlating with age at just 0.38—far too weak to be usefu