Research & practical guides

A little clarity before you buy.

Understand the evidence, compare the costs and put biological-age results in perspective.

Choosing a test4 min read

A useful shortlist begins with the question you want to answer, not a universal winner.

Comparison4 min read

Compare the output, the underlying measurement and the practical commitment.

Understanding the evidence5 min read

Reliability, age prediction and health-outcome prediction are three different questions.

Choosing a test4 min read

“Blood” describes a sample; “DNA methylation” describes a measurement.

Interpreting results4 min read

Different training targets and measurements can produce different answers from the same person.

Method explainer4 min read

An introduction to the blood-based model and what its result can—and cannot—mean.

Comparison4 min read

Understand the difference between a clinical-biomarker composite and a methylation clock.

Practical guide3 min read

Look past the kit price and calculate the cost of your intended testing plan.

Wearables4 min read

A wearable can produce an age-like estimate without performing a molecular assay.

Practical guide3 min read

There is no universal retesting schedule that applies to every method and person.

A clearer view of aging research.