How old is a boy when his penis is full grown? -
Around 24-25yo.
Read below for the research I-ve found. I-ve also provided links from some of the readings.
The ��average�� length of an erect adult penis is about 5.5- - 6-.
It��s worth remembering that the average adult penis is -designed- to fit the average depth of the adult vagina which is also
about 6-.
There is no normal or average size for a soft/flaccid penis because they vary enormously. Some guys ��shrink�� a lot more than
others when soft. You can NEVER judge how big a guy will be when he is erect from his soft penis size.
The ��average�� girth of an erect adult penis, that is the distance AROUND the penis measured at the thickest point, is about
5-. Anywhere between 4.7�� and 5.2�� is normal.
Most penis growth happens between the ages of 12 and 16 with a subsequent slower rate of growth until the age of 17 or 18.
Sometimes up till about 24 or 25yo.
Approximate lengths for under 18��s are:
At the beginning of puberty 2.4��
12 to 13 ....... 3.0- to 4.0��
14 to 15 ....... 4.0- to 5.0��
16 to 17 ....... 5.0- to 6.0��
To convert to cm, just multiply the number in inches by 2.54cm. For example, 5 X 2.54 = 12.7 So a 5- penis is 12.7cm
