Clarified what aging-clock results can—and cannot—show

Reworked the aging-clock limitations, clock-comparison, and testing-frequency guidance. The pages now distinguish association from validation, explain measurement error, biological variability, and regression to the mean, and clarify that a short-term score change may not represent durable health change.

Without these distinctions, readers could overinterpret small score movements, compare unlike clock outputs, or treat a research biomarker as diagnosis or treatment guidance.

Readers get clearer expectations for what a result means, which outcomes have actually been studied, and when repeat testing is—or is not—informative.