Researchers say the average erect penis length is 5.1 to 5.5 inches, though you should take these numbers with a grain of salt, understanding that everyone develops at a different rate....

Learn the average penile length by age 16, what to expect as your penis grows and, ultimately, reaches its final size, and when you should see your doctor.

Penis stretching refers to using your hands or a device to increase the length or girth of your penis. Although there’s evidence to suggest that stretching can increase your size, the results...

Most human penis growth occurs in two stages: the first between infancy and the age of five; and then between about one year after the onset of puberty and, at the latest, approximately 17 years of age. [1]

How big a male's penis gets depends on genetics, though some researchers suggest environmental factors may also play a role. Bulgarian scientists studied penis growth in about 6,000 males in a 2010 study and found that boys from rural areas had slightly longer penises (by about one-fifth of an inch) than those from urban areas.