Expanded the biological-age introduction with source-linked explanations of three kinds of result and their interpretation limits.
What is biological age? now distinguishes chronological age from a model estimate, replaces the old two-part framing with age-like, risk-like and pace results, and explains that an age gap is not a speed. Pace examples are framed relative to the clock reference group rather than as an exact personal speed.
New sections discuss whether scores can change, summarize the CALERIE and DO-HEALTH findings with their limits, and answer common questions about differing results, choosing a test, retesting and diagnosis. The guide says a falling score is not proof of better health. Its source list identifies relevant declared commercial ties.
The introductory page needed to distinguish what different scores were built to predict without turning group findings into personal forecasts.
The guide provides more context for interpreting results, not a diagnosis or proof that changing a score improves long-term health. It discloses AI assistance and separate AI review, not external expert validation.
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