Normal, bound and nonbound testosterone levels in normally ageing men: results from the Massachusetts Male Ageing Study

Objective  There is little consensus on what androgen levels are ‘normal’ for healthy, ageing men. Using data from the Massachusetts Male Ageing Study (MMAS), we estimated age‐specific, normal androgen levels for men aged 40–79 years while accounting for health status and behavioural factors known to influence hormone levels.

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