Research about Penis Size

Penis Size
   The average normal length of a stretched penis begins at the age of 13 years old and finishes at about 16 years old. The average normal circumference of a stretched penis increases over time from 10 years to 18 years of age.
A normal erection of a 14-year-old boy would be 70% of the fully-grown size. Smaller penises increased more in size when erected – compared to larger penises. African Americans have longer penises than Caucasian Americans. Approximately 42% of Australian men have an erect penis length of 16 to 17cm. Range of 12cm to 23cm. Nigerian men have the longest average length of approximately 17cm. Korean men having the shortest average length of 12.7 cm.