While researchers found Black penises were larger on average, the difference was only a quarter of an inch.
One study of Brazilian men compared penis sizes of people who identified as either Black or white. Ethnicity and race: There is some evidence that race and ethnicity affect penis size, though the research is limited.After that, penis size is basically 'set,' although older age can lead to a reduction. The penis may continue to grow until a person is around 21. On average, the penis undergoes its most rapid growth between ages 12 and 16. Age: Penis growth is influenced by a surge of testosterone during puberty, which typically starts between the ages of 10 and 14.
Exposure to endocrine disruptors at this age can also slow genital growth. Research shows malnutrition slows genital development and delays puberty.
