This is by far the #1 most frequently asked question.
These statistics are not clinical measurements, they are the average results of people who answered an internet poll. If you know you are a late maturer, then the results for your age group will be meaningless -- you need to look at a younger age group. Don't be too concerned if you fall well outside the measurements for your age group. The penis is an organ that varies a lot from male to male - there is no “right” or “wrong” when it comes to penis size.
Measured along the top, how long is your erect penis?
By age, the penis size averages found were:
Age---------------Size
12 ----- 4.1" (104mm)
13 ----- 5.1" (130mm)
14 ----- 6.0" (152mm)
15 ----- 6.1" (155mm)
16 ----- 6.3" (160mm)
17 ----- 6.5" (165mm)
18 ----- 6.4" (163mm)
19 ----- 6.2" (157mm)
20 ----- 6.2" (157mm)
Conclusions:
The average adult penis size is about 6.2 inches or (157mm). It is interesting that in this study, penis size 'peaks' at age 17. Since penises do not get smaller as a male approaches age 21, it can be concluded that boys aged 16, 17, and 18 are most likely to exaggerate the size of their penises. Just a guess. (Several physicians suggested that the average penis size was about 6 inches, but they weren't measuring.)
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