A
13 year old boy is well.. A male which has turned 13. A boy of this age usually thinks he is bad ass, just because he has finally become a teenager. Usually,
13 year old males do not have any pubic hair, and have a brain mass that is equivalent to that of a mouse. They are very easy to troll online, and make a very excellent target to any beginning trolls.
Encyclopedia Dramatica created a page about children of this age.
A 13 year old will usually try to act "Gangster", and will fail horribly at it. They will jack off to Pornhub about 3 times a day, and have little knowledge about female anatomy. Sad, isn't it?