13 is still very young to be worried about this. Most penis growth occurs during puberty, though there may be continued growth into a man’s early 20's. Puberty usually begins between the of 9 and 14 and lasts up to five years or so, depending on the age at which it starts.

 

Despite what you may hear or read, NO special exercises, supplements, or diets will change your penis size or make it grow faster..

 

Please be assured there are still quite a few years to grow your penis. Also, remember that there is a wide range of normal penis sizes. Although you may see guys with penises that are bigger or smaller than yours, your penis is likely a normal size. Penis sizes, like eye colour or foot size, are determined by genes.