17~ 18 years old, how long does it take for the penis to erect? The male penis is divided into two parts: the outside and the inside! Therefore, the length of penis depends on erection! Fat patients will have a short penis because of more subcutaneous fat! Moreover, there will be some deviation between the measured seat length and the standing length, which also depends on the subcutaneous fat of the abdomen! It is recommended to take the standing length! The normal range of penis length is 12- 15cm, and the shortest is 10cm for boys. At the age of 20, the growth rate of penis begins to slow down, and it basically stops at the age of 25, and the growth rate of penis will not exceed 1cm between the ages of 20 and 25. ~ ~ ~ ~ ~ ~ ~ From infants to adults (years old), penis length and testicular size and age

Penile length (cm standard deviation)

Testicular diameter (cm standard deviation)

0.2~2

2.7 0.5

1.4 0.4

2. 1~4

3.3 0.4

1.2 0.4

4. 1~6

3.9 0.9

1.5 0.6

6. 1~8

4.2 0.8

1.8 0.3

8. 1~ 10

4.9 1

2 0.5

10. 1~ 12

5.2 1.3

2.7 0.7

12. 1~ 14

6.2 2

3.4 0.8

14. 1~ 16

8.6 2.4

4. 1 1

16. 1~ 18

9.9 1.7

5 0.5

18. 1~20

1 1 1. 1

5 0.3

20. 1~25

12.4 1.6

5.2 0.6