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"Training age" (how long and how effectively someone has trained) — not chronological age — determines how fast they can progress and how complex their programming needs to be.
Training age is the cumulative duration and quality of consistent, progressive training. It drives the diminishing-returns curve of adaptation:
Practical classification (general consensus, e.g., NSCA / Rippetoe's novice-intermediate-advanced framing):
This continuum is goal- and lift-specific: someone can be advanced in one lift/quality and novice in another. Always individualize (individuality) and apply progressive overload at the appropriate rate (progressive-overload, progressive-overload-application).
Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.