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The duration and stages of penile growth during male puberty, with variations depending on population and measurement methods
The evidence shows a consistent pattern: testosterone exposure matters for penile growth before and during puberty but has little clear effect on adult penile size, while simple body measures (height,...
Most males reach their final penis size around the end of puberty — commonly by the late teens — with medical sources clustering the typical age range between about 16 and 21 years old, and many citin...
Scientific studies show penis girth (circumference) increases through puberty and generally reaches adult values by late adolescence or early adulthood, with most large, measured-sample reviews placin...
Medical definitions set clear red lines: puberty before age eight in girls or nine in boys is considered precocious and merits evaluation, and lack of breast development by 13 in girls or testicular e...
Age largely determines when final penis length and girth are reached—by the end of puberty most growth has occurred—while adult BMI modifies measured and visible length (often reducing apparent length...
High-quality, investigator-measured studies converge on an average erect penile length of roughly 13 cm (about 5.1–5.2 inches) for adult men, but the peer‑reviewed literature rarely supplies robust, c...
Most high-quality reviews find measurable but generally modest differences in penile length by geography/ethnicity, little consistent change with adult age after full maturation, and only weak or inco...